Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency

1 Answer

Answer :

a) E.M.F : The electromotive force of a battery is defined as the energy spent or the work done in taking a unit positive charge around the complete circuit of the battery i.e., in the circuit outside the cell as well as in the electrolyte inside the cell. When no current is drawn from a battery i.e. when the battery is in open-circuit condition, then potential difference between the terminals of the battery is its E.M.F. 

b) Internal resistance: The resistance within the source that causes a drop in the source voltage when load current flows, is called internal resistance. 

c) AH efficiency: Ampere-hour efficiency of a battery is defined as the ratio of the output of battery in amp-hr during discharging to the input amp-hr of battery during charging.

d) Watt – Hr efficiency: The ratio of the output of a battery, measured in watt-hours, to the input required to restore the initial state of charge, under specified conditions, is called Watt-hr efficiency.

Related questions

Description : For maximum transfer of power, internal resistance of the source should be?

Last Answer : For maximum transfer of power, internal resistance of the source should be equal to load resistance.

Description : State the concept of internal voltage drop.

Last Answer : Concept of internal voltage drop: Every practical source offers some opposition to the current due to its internal parts or components. e.g. a 12V battery has electrodes made up of conducting ... internal voltage drop, the terminal voltage of practical voltage source is always less than its emf. 

Description : What is internal voltage drop and terminal voltage?

Last Answer : It is not permissible to just connect the positive terminal to the negative terminal of a cell with a copper wire. It will overheat and get damaged. This happens because the electromotive force (emf) ... than the nominal voltage (emf) of the cell and this lower voltage is called terminal voltage.

Description : Write down the steps involved for internal thread cutting on lathe machine.

Last Answer : Steps involved for internal thread cutting on lathe machine  1) Hole is first bored to the root diameter of the thread. 2) Tool is fixed on the tool post or on the boring bar adjusted the angle of ... the start. 10) Keep going until the calculated depth of cut has been reached on the top slide.

Description : List the types of Internal wiring in residential installations –

Last Answer : 1) Cleat wiring 2) Batten wiring 3) Wooden casing capping wiring 4) PVC conduit wiring 5) PVC casing capping wiring 6) Concealed wiring

Description : 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

Description : Sketch internal design of 4x3 ROM.

Last Answer : The internal design of 4x3 ROM

Last Answer : Large internal faults are protected by merz price percentage differential protection.

Last Answer : Yes BJT have internal capacitances.

Description : EPROM internal structure

Last Answer : EPROM (Erasable Programmable ROM): EPROM stands for Erasable Programmable ROM.Data is stored in EPROM memory cell as an electrostatic charge on highly insulated conductor. The charge can remain for ... figure shows EPROM memory cell consisting of a single NMOS filed effect transistor. 

Description : Define resistance with its unit.

Last Answer : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage.  Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

Description : Define pinch off voltage and drain resistance of FET.

Last Answer : 1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.

Description : What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

Last Answer : What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

Description : Temperature co-efficient of resistance is expressed in terms of?

Last Answer : Degree celsius

Description : International ohm is defined in terms of the resistance of?

Last Answer : International ohm is defined in terms of the resistance of a column of mercury.

Description : State the procedure for testing of earth pit resistance with necessary diagrams.

Last Answer : Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required. 

Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

Last Answer : equivalent resistance

Description : How does the resistance of a conductor compare to that of an insulator?

Last Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

Description : Parallel Reactance and Resistance Example 1

Last Answer : Parallel Reactance and Resistance Example 1

Description : AC Circuits with Resistance but No Reactance

Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

Description : Problems on resistance and resistivity

Last Answer : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

Description : Problem on temperature coefficient of resistance 3

Last Answer : Problem on temperature coefficient of resistance 3

Description : Problem on temperature coefficient of resistance 2

Last Answer : Problem on temperature coefficient of resistance 2

Description : Problem on temperature coefficient of resistance 1

Last Answer : Problem on temperature coefficient of resistance 1

Description : Problem on resistance and resistivity 13

Last Answer : Problem on resistance and resistivity 13

Description : Problem on resistance and resistivity 12

Last Answer : Problem on resistance and resistivity 12

Description : Problem on resistance and resistivity 11

Last Answer : Problem on resistance and resistivity 11

Description : Problem on resistance and resistivity 10

Last Answer : Problem on resistance and resistivity 10

Description : Problem on resistance and resistivity 9

Last Answer : Problem on resistance and resistivity 9

Description : Problem on resistance and resistivity 8

Last Answer : Problem on resistance and resistivity 8

Description : Problem on resistance and resistivity 7

Last Answer : Problem on resistance and resistivity 7

Description : Problem on resistance and resistivity 6

Last Answer : Problem on resistance and resistivity 6

Description : Problem on resistance and resistivity 5

Last Answer : Problem on resistance and resistivity 5

Description : Problem on resistance and resistivity 4

Last Answer : Problem on resistance and resistivity 4

Description : Problem on resistance and resistivity 3

Last Answer : Problem on resistance and resistivity 3

Description : Problem on resistance and resistivity 2

Last Answer : Problem on resistance and resistivity 2

Description : Problem on resistance and resistivity 1

Last Answer : Problem on resistance and resistivity 1

Description : Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Last Answer : Methods for measurement of low resistance:  1. Ammeter voltmeter method  2. Kelvin's bridge method  3. Ohm meter method  4. Potentiometer method  5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible.  2. Connection errors.

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

Description : Write any two factors on which earth resistance depends.

Last Answer : Factors on which earth resistance depends: (1) The shape and material used for the electrode (2) Depth of the electrode in the ground. (3) The specific resistance of the soil around the electrode (4) Moisture content in the soil. (5) Nature of soil 

Description : State the use of shunt and series resistance used in extension of meter.

Last Answer : Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

Description : State the range for low and medium resistance.

Last Answer : Low resistances: less than 1 ohm.  Medium resistances: 1 ohm to 0.1 Mega ohm. 

Description : Explain V- I method of measurement of medium resistance. 

Last Answer : In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. Take reading of voltmeter and ammeter, then value of resistance = R = V/I Ω To minimise the error take 4 to 5 observation for the same resistance and take their average.

Description : Give classification of resistance based on their ranges.

Last Answer : Classification of Resistances Based on Their Ranges: 1) Low resistance: less than 1 ohm. 2) Medium resistance: 1 ohm to 0.1 Mega ohms. 3) High resistance: greater than 0.1 Mega ohms.

Description :  A resistor in which the resistance changes exponentially with change in temperature is called as A) Potentiometer B) Phototransistor C) Varactor D) Thermistor 

Last Answer :  A resistor in which the resistance changes exponentially with change in temperature is called as Thermistor 

Description : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

Last Answer : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

Description : Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

Last Answer : Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

Description : What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these

Last Answer : What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these

Description : What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same

Last Answer : Automatically the resistivity will increase as they are the factors affecting the resistivity 

Description : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

Last Answer : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these