What kills, current or voltage?
Last Answer : Current would kill. You can actually have thousands of bolts going through you and not even know it. Yes you probably know already voltage is current times resistance. Since your body is a resistor it would take just a small amount of current to create a very high voltage
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149 views
3 answers
asked
Aug 25, 2019
by
anonymous

Why inductor current lags inductor voltage ?
Last Answer : Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor
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113 views
1 answer
asked
May 24, 2019
by
anonymous

Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform
Last Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or ... current is leading the voltage or the voltage is said to be lagging behind the current.
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141 views
1 answer
asked
Sep 7, 2018
by
anonymous

Step-down transformer converts high voltage and low current into: (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above
Last Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current
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126 views
1 answer
asked
May 8, 2018
by
anonymous

Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
Last Answer : Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
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262 views
1 answer
asked
May 8, 2018
by
anonymous

A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier
Last Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier
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121 views
1 answer
asked
Apr 30, 2018
by
anonymous

A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network
Last Answer : A network that consists of at least a voltage source or current source is called Active network
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121 views
1 answer
asked
Apr 29, 2018
by
anonymous

Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Last Answer : 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series. 2) ... 4) Effect on Life:- If supply voltage is not stable then life of LED get reduced.
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106 views
1 answer
asked
May 3, 2020
by
anonymous

With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.
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246 views
1 answer
asked
May 2, 2020
by
anonymous

Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage
Last Answer : Definition of parameters of OPAMP is follows: i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.
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686 views
1 answer
asked
May 2, 2020
by
anonymous

A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.
Last Answer : Solution
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162 views
1 answer
asked
Apr 1, 2020
by
anonymous

Source transformation voltage source to current source and vice versa
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99 views
0 answers
asked
Mar 21, 2020
by
anonymous

Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.
Last Answer : 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1
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2.7k views
1 answer
asked
Aug 12, 2018
by
anonymous

Write the relation between phase and line current, phase and line voltage for Star connection.
Last Answer : Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection
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384 views
2 answers
asked
Aug 11, 2018
by
anonymous

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω
Last Answer : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω
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2.7k views
1 answer
asked
Jun 18, 2018
by
anonymous

Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem
Last Answer : Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem
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337 views
1 answer
asked
Apr 29, 2018
by
anonymous

The internal resistances of an ideal current source, and an ideal voltage source are, respectively, (A) 0, ∞ (B) ∞, ∞ (C) ∞, 0 (D) 0,0
Last Answer : The internal resistances of an ideal current source, and an ideal voltage source are, respectively, ∞, 0
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181 views
1 answer
asked
Apr 28, 2018
by
anonymous

A network is said to be under resonance when the voltage and the current at the network input terminals are (A) in phase (B) out of phase (C) in phase quadrature (D) in phase, and have equal magnitudes
Last Answer : A network is said to be under resonance when the voltage and the current at the network input terminals are in phase
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86 views
1 answer
asked
Apr 28, 2018
by
anonymous

Last Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.
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154 views
1 answer
asked
Mar 19, 2018
by
anonymous
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Why does increase in current mean a decrease in voltage?
Last Answer : This is because current flows from high potential to low potential to bring the two diffrent potential to unity , thus a reduced potential (voltage)
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166 views
1 answer
asked
Mar 10, 2018
by
anonymous

About trnsformer
Last Answer : Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer
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120 views
1 answer
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When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is?
Last Answer : If v = 1 volt and i = 1 micro amp, i= 10^(-6) So R = V/I, R= 1/10^(-6) , R= 10^6 And now Conductance G = 1/R So G = 10^(-6) mho..... Answer
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918 views
2 answers
asked
Mar 25, 2018
by
anonymous

Refer to the circuit below. The total absorbed (consumed) power is:
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19 views
0 answers

Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.
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93 views
0 answers
asked
Aug 11, 2018
by
anonymous

Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.
Last Answer : Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).
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1.7k views
1 answer
asked
Aug 8, 2017
by
anonymous

When an alternating current passes through an ohmic resistance the electrical power converted into heat is?
Last Answer : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.
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966 views
1 answer
asked
Mar 25, 2018
by
anonymous

A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current decreases.
Last Answer : The question seems to be wrong. Increase in frequency would actually decrease the current through the Inductor. This happens because inductive reactance Xl is directly proportional to frequency. And if frequency increases the value of Xl would ... vice versa. Xl= 2*pi*f*L I=E/Z Z=sqrt(R^2+Xl^2)
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124 views
1 answer
asked
Nov 23, 2017
by
James

Why is it cheaper to transmit electrical energy at high voltage?
Last Answer : Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper
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169 views
1 answer
asked
Mar 10, 2018
by
anonymous

a dc generator has a terminal voltage of 250V and an induced voltage of 262V when the generator is loaded. the brush drop is 1volt per brush and the armature resistance is 0.03 ohm ... reaction and determine the following: the load current the power of the load the percentage voltage regulation.
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13 views
0 answers
asked
Aug 3, 2021
by
yanga

The inrush current of a transformer at no load is maximum if the supply voltage is switched on (1) at peak voltage value (2) at zero voltage value (3) at half voltage value (4) at 0.866 time voltage value
Last Answer : At 0.866 time voltage value
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114 views
2 answers
asked
Apr 30, 2018
by
anonymous

Define: i) Knee voltage ii) Reverse saturation current
Last Answer : i) Knee voltage : The applied forward voltage, at which the PN junction starts conducting and current starts increasing exponentially is called knee voltage. It is 0.7V for Si and 0. ... semiconductor diode caused by diffusion of minority carriers from the neutral regions to the depletion region.
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156 views
1 answer
asked
Aug 19, 2019
by
anonymous
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The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above
Last Answer : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA
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201 views
1 answer
asked
May 8, 2018
by
anonymous

If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?
Last Answer : 128 volts ,2048 watts
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127 views
2 answers
asked
Oct 21, 2017
by
anonymous

Direct Current (DC) Next Topic : Alternating current (AC)
Last Answer : Direct Current (DC) is the unidirectional electric current. Uni meaning is one. And the flow of charge in same direction. We know that conventional current flow from positive terminal of battery to ... The magnitude of DC may constant or vary but direction do not change with respect to time.
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222 views
3 answers
asked
Nov 22, 2019
by
anonymous

Alternating current (AC)
Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.
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185 views
2 answers
asked
Nov 22, 2019
by
anonymous

Does current flow through a capacitor ?
Last Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...
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103 views
1 answer
asked
Aug 25, 2019
by
anonymous

A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?
Last Answer : The current is 10.0A. 1ampere = 1 Coulomb per 1 second. 0.1Coulombs ÷ 0.01seconds = 10.0amperes.
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415 views
1 answer
asked
Jul 1, 2019
by
anonymous

Describe the difference between direct and alternating current.
Last Answer : Direct current is the flow of electricity or charge in one direction.. Alternative current is the flow of charge that doesn't flow in one direction.
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5.3k views
4 answers
asked
Jun 29, 2019
by
anonymous
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Explain why potential difference is necessary to produce current in a circuit.
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99 views
0 answers
asked
Jun 29, 2019
by
anonymous

Kirchhoff's Current Law
Last Answer : Kirchhoff's current law
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2.6k views
1 answer
asked
Jun 11, 2019
by
anonymous

Current ratio
Last Answer : Current ratio
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71 views
1 answer
asked
Jun 11, 2019
by
anonymous

Current divider rule
Last Answer : Current divider rule
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2.5k views
1 answer
asked
Jun 11, 2019
by
anonymous

Current formula
Last Answer : Current formula
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76 views
1 answer
asked
Jun 11, 2019
by
anonymous

Capacitive current
Last Answer : Capacitive current formula
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77 views
1 answer
asked
Jun 11, 2019
by
anonymous

How to find total impedance Z, current I and Impedance angle ?
Last Answer : How to find total impedance Z, current I and Impedance angle ?
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165 views
2 answers
asked
May 30, 2019
by
anonymous
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List out any four effects of electric current used in measuring instruments & write name of meter working on it.
Last Answer : Effects of Electric Current used in measuring instruments: 1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc. 2. Electromagnetic induction ... . Electrostatic effect: Voltmeters. 5. Hall Effect: Flux meter, Poynting vector wattmeter.
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1.0k views
1 answer
asked
Sep 6, 2018
by
anonymous
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State various effects of electric current and explain any one.
Last Answer : Effects of Electric Current: 1. Magnetic Effect: When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying ... The rise in temperature is converted into elongation of hot wire element causes displacement of pointer.
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121 views
2 answers
asked
Sep 4, 2018
by
anonymous

In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero
Last Answer : In a series R-C circuit, with the increase in frequency, current Increases
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111 views
1 answer
asked
May 8, 2018
by
anonymous

A 1000Ohm, 1 Watt resistor can safely pass a current of
Last Answer : A 1000 Ohm, 1 Watt resistor can safely pass a current of 30 mA
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463 views
1 answer
asked
May 8, 2018
by
anonymous

For a round wire, the approximate value of fusing current is given by
Last Answer : For a round wire, the approximate value of fusing current is given by K√d3
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238 views
1 answer
asked
May 3, 2018
by
anonymous
