Question

The current flowing through a resistor is 0.8 A when a potential difference of 20 V is applied. Determine the value of the resistance. 

Answer 1

The resistance can be found from the Ohm's law:

$$R = \dfrac{U}{I}$$

where $U = 20V$ is the potential difference, and $I = 0.8A$ is the current through the resistor.

Thus, obtain:

$$R = \dfrac{20V}{0.8A} = 25\Omega$$

Answer. 25 ohms.