Question

2. A light bulb in a battery-powered desk lamp has a current of 0.042 A and is connected to a
9.2 V battery. What is the resistance in the desk lamp?

Answer 1

• Potential Difference=9.2V
• Current=I=0.042A
• Resistance=R

Using ohms law

$\\ \sf\longmapsto R=\dfrac{V}{I}$

$\\ \sf\longmapsto R=\dfrac{9.2}{0.042}$

$\\ \sf\longmapsto R=219.04\Omega$