A torch bulb is rated $5 V$ and $500 m A$ .
Calculate its b. resistance

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Solution

Step 1- Given data and formulas,
Applied voltage $V = 5 V$
Current through the bulb $I = 500 m A$
According to Ohm's law,
$V = I R$
Where $R$ is the resistance.
Note: $1 m A = 10^{- 3} A$
Step 2- Finding the resistance,
Substitute the values of electric current and applied voltage into the formula to find the resistance of the bulb.
$5 V = 500 \times 10^{- 3} A \times R R = \frac{5}{0.5} R = 10 Ω$
Thus, the resistance of the bulb is $10 Ω .$

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