Question

A cell of potential difference 12 V is connected to a bulb. The resistance of the filament of the bulb when it glows is 24 ohm. Find the current drawn from the cell.

Answer 1

Answer:

Data: P.d = 12 V, R=24 ohm, I=?

Solution: I= V/R = 12/24 = 0.5 Amp.

Answer 2

Given:

A cell of potential difference 12 V is connected to a bulb

The resistance of the filament of the bulb when it glows is 24Ω

To Find:

The current drawn from the cell

Solution:

The current drawn from the cell is 0.5 A.

When a bulb is attached to a cell, a potential difference is generated across the two terminals of the bulb.

In such a situation, a current flows through the terminal of the bulb that is at the high potential to the terminal that is at low potential.

The current can be calculated using Ohm's law that states that in a closed circuit with resistance R, potential difference V and current I,

V ∝ I

or V = IR

Substituting the values,

12 = I X 24

or I = 12 / 24

= 1 / 2

= 0.5