Kelvin's double bridge is used to measure low resistances because

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Kelvin's double bridge is used to measure low resistances because effect of contact and lead resistances is eliminated.

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Kelvin’s Double Bridge Practical

Description : Kelvin’s Double Bridge Practical

Last Answer : Practical Significance The conductors are generally made from copper & aluminum. They are having low resistance. It is essential to measure its resistance precisely to calculate the voltage drop per kilometer when ... for 2/3 samples. 7. Calculate the value of unknown resistance R.

A bridge used to measure small resistances

Description : A bridge used to measure small resistances

Last Answer : Kelvin Bridge

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Description : Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Last Answer : Following are the methods used to measure resistances:-  (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method  (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method  (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. When a resistance `15 Omega` is conne

Description : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. When a resistance `15 Omega` is conne

Last Answer : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. ... the value. A. 3 B. 6 C. 9 D. 12

What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?

Description : What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?

Last Answer : Wein Bridge

What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?

Description : What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?

Last Answer : Wein Bridge

If an inductance is connected in one arm of bridge and resistances in the remaining three arms?

Last Answer : If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

Why the input resistance of an ideal OPAMP is infinite and output resistance is zero? secondly, how can we measure these resistances(input and output) in case of an ideal OPAMPand Real OP-AMP in the following conditions when 1- load is not connected. 2- load is connected.

Description : Why the input resistance of an ideal OPAMP is infinite and output resistance is zero? secondly, how can we measure these resistances(input and output) in case of an ideal OPAMPand Real OP-AMP in the following conditions when 1- load is not connected. 2- load is connected.

Last Answer : Ans- Ideal OP-AMP is a power ful concept. If one goes through the history of amplifying devices it becomes clear that less it loads the previous stage better the output signal. ie ... . Can refer application notes by device manufacturer available in internet for more precise and practical solutions.

Write the limitations of Kelvin's formula ?

Description : Write the limitations of Kelvin's formula ?

Last Answer : As sometimes the cross section of the wire is so low that the regulation increases as the voltage drop increases . Increases , interest and waste change as space and time change.

Write Kelvin's formula ?

Description : Write Kelvin's formula ?

Last Answer : In the case of energy transport , the cross-section of the lowest cost line conductor will occur only when the annual waste and interest cost is equal to the annual waste cost .

How many kelvins is equal to ten degrees centigrade ?

Description : How many kelvins is equal to ten degrees centigrade ?

Last Answer : Ten degrees centigrade equals 283 Kelvin.

2 Degrees Celsius = How Many Kelvins ?

Last Answer : 1 degree Celsius = 263.15 Kelvin and 2 degree Celsius = 548.3 Kelvin.

If The boiling point of ethanol is 78.3 degrees Celsius what is the boiling point of ethanol kelvins?

Description : If The boiling point of ethanol is 78.3 degrees Celsius what is the boiling point of ethanol kelvins?

Last Answer : To change C to K just add 273.01 to the C temperature (78.3 C =351.3 K) You might think it is 351. 31 K but the originaltemperature was only accurate to one decimal place.

If a substance has a temperature of 273 kelvins, what is its temperature in degrees Celsius Note: C = K - 273?

Description : If a substance has a temperature of 273 kelvins, what is its temperature in degrees Celsius Note: C = K - 273?

Last Answer : Answers is the place to go to get the answers you need and to ask the questions you want

What is kelvin's economy law?

Description : What is kelvin's economy law?

Last Answer : Most economical cross section area of conductor is that which makes annual cost of energy loss equal to annual interest & depreciation on capital cost of conductor.

The variation of heat of reaction with temperature at constant pressure is given by the __________ law. (A) Kelvin's (B) Antoine’s (C) Kirchoff’s (D) None of these

Description : The variation of heat of reaction with temperature at constant pressure is given by the __________ law. (A) Kelvin's (B) Antoine’s (C) Kirchoff’s (D) None of these

Last Answer : (C) Kirchoff’s

If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as (a) Kelvin's law (b) Ohm's law (c) Kirchhoffs law (d) Faraday's law (e) none of the above

Description : If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the ... (b) Ohm's law (c) Kirchhoffs law (d) Faraday's law (e) none of the above

Last Answer : (a) Kelvin's law

Give ranges of low and high resistances.

Description : Give ranges of low and high resistances.

Last Answer : 1) Ranges of low resistance: Less than 1 ohm.  2) Ranges of high resistance: Greater than 0.1 Mega ohm.

Accurate measurement of very low resistances is possible with

Description : Accurate measurement of very low resistances is possible with (A) Megger (B) Wheatstone Bridge (C) Kelvin’s Double Bridge (D) Wagner’s Earthing Device

Last Answer : Accurate measurement of very low resistances is possible with Kelvin’s Double Bridge

State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line

Description : State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line

Last Answer : Significance of earthing:  * Earthing means connecting the body of the electrical equipment (it means the part which does not carries current under normal condition) to the earth. For example electrical equipment' ... surrounded by charcoal and salt.  the values of earth resistances for: 

When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel,

Description : When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by • 2 W, 1 W • 5 W, 2 W • 10 W, 5W • 15 W, 10 W

Last Answer : When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by 2 W, 1 W

If three resistances are added in series, their resultant will be:

Description : If three resistances are added in series, their resultant will be: A. Same B. sum of all C. Zero D. Inverse sums of all  

Last Answer : If three resistances are added in series, their resultant will be: sum of all 

Three resistances of 3 Ω each are connected in delta. The value of the resistances in the equivalent star is ...

Description : Three resistances of 3 Ω each are connected in delta. The value of the resistances in the equivalent star is : (A) 27 (B) 9 (C) 1.5 (D) 1 Ω

Last Answer : 9

If two resistances of 10 Ω and 10 Ω are connected in parallel the equivalent resistance is _________.

Last Answer : If two resistances of 10 Ω and 10 Ω are connected in parallel the equivalent resistance is 5 Ω.

Two resistances R1 and R2 give combined resistance of 4.5 ohms when...

Description : Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are

Last Answer : Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are 1.5 ohms and 3 ohms.

When n resistances each of value r are connected in parallel, then ...

Description : When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is

Last Answer : When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is n2 x.

are AC and DC resistances same?

Description : are AC and DC resistances same?

Last Answer : Resistance is the ability of a circuit or element (which is called resistor) to oppose current. Examples of Resistors with the ability of high resistance are Wood, Air, Mica, Glass, Rubber, Tungsten ... constant. Therefore, only the original resistance of wire comes into play. they are not the same

Kelvin double bridge is best suited for the measurement of:

Last Answer : Kelvin double bridge is best suited for the measurement of: Low resistance

You are calibrating a multimeter using internal batteries to supply power for resistance measurements. However, you are unable to adjust the pointer to 'zero' using the adjustment knob. Therefore, you should _____________. A. replace the batteries in the instrument B. measure resistance by dividing the voltmeter indication by the ammeter indication C. set the pointer using a bridge D. change scales to the R X 100 scale and adjust using the 'zero ohms' adjusting knob

Description : You are calibrating a multimeter using internal batteries to supply power for resistance measurements. However, you are unable to adjust the pointer to 'zero' using the adjustment knob. Therefore, you should ... change scales to the R X 100 scale and adjust using the 'zero ohms' adjusting knob

Last Answer : Answer: A

When a bridge is used to measure resistance, what is the value of Rx if R1 equals 80 ohms, R2 equals 120 ohms, and R3 equals 280 ohms?

Description : When a bridge is used to measure resistance, what is the value of Rx if R1 equals 80 ohms, R2 equals 120 ohms, and R3 equals 280 ohms?

Last Answer : 420 ohms.

Bridge used to measure both inductive and capacitive impedances at higher frequencies

Description : Bridge used to measure both inductive and capacitive impedances at higher frequencies

Last Answer : radio-frequency bridge

What bridge is used to measure high-Q inductors? (Q>10)

Description : What bridge is used to measure high-Q inductors? (Q>10)

Last Answer : hay bridge

The bridge used to measure the dielectric loss of an insulator is:

Description : The bridge used to measure the dielectric loss of an insulator is: A) Anderson bridge B) Wien’s bridge C) Schering bridge D) Any of the above

Last Answer : C)Schering bridge

A Wien bridge is used to measure

Description : A Wien bridge is used to measure (A) quality factor of a coil (B) audio frequency of a signal (C) capacitance of a capacitor (D) inductance of a coil 

Last Answer : D)  Inductance of a coil

Maxwell's bridge is used to measure

Description : Maxwell's bridge is used to measure (A) Inductance (B) Frequency (C) Capacitance (D) Resistance

Last Answer : Maxwell's bridge is used to measure Inductance 

Schering bridge is used to measure

Description : Schering bridge is used to measure  (1) Frequency (2) Inductance (3) Capacitance (4) Mutual Inductance

Last Answer : 3

Maxwell-Wien bridge is used to measure

Last Answer : Maxwell-Wien bridge is used to measure Inductance.

Anderson Bridge is used to measure:

Last Answer : Anderson Bridge is used to measure: L.

Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Description : Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Last Answer : (B) When heat transfer area required is very low, i.e. (100-200 ft 2 )

Two cells connected in series have electromotive force of 1.5 V each. Their internal resistances are `0.5 Omega` and `0.25 Omega` respectively. This c

Description : Two cells connected in series have electromotive force of 1.5 V each. Their internal resistances are `0.5 Omega` and `0.25 Omega` respectively. This c

Last Answer : Two cells connected in series have electromotive force of 1.5 V each. Their internal ... potential differnce across the terminals of each cell.

Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega`, respectively are connected in parallel so as to send curre

Description : Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega`, respectively are connected in parallel so as to send curre

Last Answer : Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega` ... of `5 Omega`. Find the current in the external circuit.

When a current of 0.5 A is passed through two resistances in series, the potential difference between the ends of the series arrangement is 12.5 V. On

Description : When a current of 0.5 A is passed through two resistances in series, the potential difference between the ends of the series arrangement is 12.5 V. On

Last Answer : When a current of 0.5 A is passed through two resistances in series, the potential difference between ... ends is 6 V. Calculate the two resistances.

Find the potential difference between the points A and B in the circuit shown in Fig. 4.66. Internal resistances of the cells are negligible.

Description : Find the potential difference between the points A and B in the circuit shown in Fig. 4.66. Internal resistances of the cells are negligible.

Last Answer : Find the potential difference between the points A and B in the circuit shown in Fig. 4.66. Internal resistances of the cells are negligible.

A combination of four resistances is shown in Fig. 4.59. Calculate the potential difference between the points P and Q, and the values of currents flo

Description : A combination of four resistances is shown in Fig. 4.59. Calculate the potential difference between the points P and Q, and the values of currents flo

Last Answer : A combination of four resistances is shown in Fig. 4.59. Calculate the potential difference ... of currents flowing in the different resistances.

Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

Description : Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

Last Answer : Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Description : How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Last Answer : How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Two wires of different materials have resistances in the ratio `4 : 3`, lengths in the ratio `2 : 1` but have same radii of cross-section. Compare the

Description : Two wires of different materials have resistances in the ratio `4 : 3`, lengths in the ratio `2 : 1` but have same radii of cross-section. Compare the

Last Answer : Two wires of different materials have resistances in the ratio `4 : 3`, lengths in the ... same radii of cross-section. Compare their resistivities.

Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.

Description : Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.

Last Answer : Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.