A is a device that sets up a constant potential difference across a conductor in an electric circuit.

resistor

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battery

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voltmeter

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generator

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Solution

The correct option is B battery
A battery is a type of an emf device that is responsible for the potential difference across a component in an electric circuit. Because of this, the electric field will be able to persist in the circuit and the flow of electric current happens.

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Question 22
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 $Ω$ in series with a combination of two resistors (4 $Ω$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 $Ω$ resistors be the same as that across the parallel combination of 4 $Ω$ resistors? Give reason.

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(b) voltmeter
(c) resistor
(d) battery

Q. A resistor of 4-ohm resistance and an electric lamp of 20-ohm resistance are connected in series across a 6-volt battery. Draw a labelled circuit diagram by using the symbols for ohm and volt. Calculate:
(a) total resistance of the circuit.
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(c) potential difference across the resistor.
(d) potential difference across the electric lamp.

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A is a device that sets up a constant potential difference across a conductor in an electric circuit.

The correct option is B batteryA battery is a type of an emf device that is responsible for the potential difference across a component in an electric circuit. Because of this, the electric field will be able to persist in the circuit and the flow of electric current happens.

The correct option is B battery
A battery is a type of an emf device that is responsible for the potential difference across a component in an electric circuit. Because of this, the electric field will be able to persist in the circuit and the flow of electric current happens.