Question

The drop in potential across a resistor in a circuit is 40 V. What is the current flowing through the resistor if the resistance is 2.0 ?

Answer 1

According to the Ohm's Law,

$V=IR$

where V is the potential drop, R is the resistance and I is the current flowing through the resistor.

Substituting the known values,

$\begin{gathered} 40=I\times2 \\ I=\frac{40}{2} \\ I=20\text{ A} \end{gathered}$

Thus, the current flowing through the resistor is 20 A.