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Ohm's Law

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Question

How are potential difference (V), current (I) and resistance (R) related?

A

V = I R

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B

V I = R

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C

I = V R

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D

V = R / I

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Solution

The correct option is A
V = I R

The relation between the potential difference (V), Current (I) and Resistance (R) is V = I R.

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Similar questions

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?

Q. The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are given below :

\begin{matrix} V (volts) & 0.5 & 1.0 & 1.5 & 2.0 & 2.5 & 3.0 & 4.0 & 5.0 I (amperes) & 0.1 & 0.2 & 0.3 & 0.4 & 0.5 & 0.6 & 0.8 & 1.0 \end{matrix}

Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.

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 resistance of a metal is given by

R = V / I

V

is potential difference and

I

is the current. In a circuit, the potential difference across resistance is

V = (8 \pm 0.5) V

and current in resistance,

I = (4 \pm 0.2) ˚ A

. What is the value of resistance with its percentage error?

Q. The current flowing when a potential difference of

33 V

is applied across an appliance having a resistance of

110 Ω

I

. If the same current

(I)

is to flow through an appliance having a resistance of

500 Ω

, how much potential difference should be applied across it?

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