A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?

Given:

Potential difference, V=20V

Resistance, R=5 ohms

To find:

Current, I

Solution:

According to the ohm's law:

$\mathrm{I}=\frac{\mathrm{V}}{\mathrm{R}}$

$\mathrm{I}=\frac{\mathrm{20}}{\mathrm{5}}$

= 4 A