Question

A torch bulb is rated 3V and 600mA. calculate it's resistance if it is lighted for 4 hrs . ​

Answer 1

Answer:

Resistance= 5ohm.

Explanation:

By ohm's Law, V=IR;

Use the relation to find R, R=V/I;

R=3V/600mA

R=3V/0.6A

R=5 ohms.

The resistance of the bulb is independent of the time it is run for.

Answer 2

Answer:

Resistance of the bulb = voltage / current

$= \frac{3}{600 \times {10}^{ - 3} } \\ = \frac{30}{6} \\ = 5ohms$

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