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Voltage

What is the r...

Question

What is the relation between electric potential, current and resistance?

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Solution

Electric potential (V), current (I) and resistance (R) are related as V = IR.

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Q. (a) What is the ratio of potential difference and current known as?
(b) The values of potential difference V applies across a resistor and the corresponding values of current I flowing in the resistor are given below:

Potential differences, V (in volts)	:	2.5	5.0	10.0	15.0	20.0	25.0
Current, I (in amperes)	:	0.1	0.2	0.4	0.6	0.8	1.0

Plot a graph between V and I, and calculate the resistance of the resistor.
(c) Name the law which is illustrated by the above V−I graph.
(d) Write down the formula which states the relation between potential difference, current and resistance.
(e) The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron?

The law which gives the relation between electric potential difference and electric current is called:

Ohm’s law gives the relation between potential difference and electric current.

Q. Ohm's law gives a relationship between:

(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference

Q. The potential difference between the terminals of an electric heater is 220 V and the current is 5A. What is the resistance of the heater?

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