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A torch bulb is rated at $1.5$ $V$ , $500$ $mA$ , its resistance is [[1]] $Ω$ .

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Detailed Solution

A torch bulb is rated at

1.5

V

500

mA

, its resistance is

3 Ω

.
From Ohm's law, “the potential difference across two terminals is directly proportional to the current flowing through it provided the physical conditions remain the same.” Mathematically,

V = IR

\Rightarrow R = \frac{V}{I}

Where

R, V

and

I

are the resistance, potential difference and the current flowing through the circuit respectively.
On substituting the values and we get,

R = \frac{1.5}{0.5}

\Rightarrow R = 3 Ω

Hence, the resistance of the torch is

3 Ω

.
[1]Black and white pictures, should be used.

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