Question

A lamp draws a current of 0.50 A when it is connected to a 120 V source. What is the resistance of the lamp?1) 4.17 10-2 ω2) 60 ω3) 2.4 102 ω4) 24 102 ω

Answer 1

Given data:

* The voltage of the given source is,

$V=120\text{ Volts}$

* The current through the lamp is,

$I=0.5\text{ A}$

Solution:

By the Ohm's law,

$V=IR$

where R is the resistance of the lamp,

Substituting the known values,

$\begin{gathered} 120=0.5\times R \\ R=\frac{120}{0.5} \\ R=240\text{ }\Omega \\ R=2.4\times10^2\text{ }\Omega \end{gathered}$

Thus, 3rd option is the correct answer.