Question

19. The current in a hair dryer is 12 A. The hair dryer is plugged into a 120-V outlet. Howmuch electric resistance is there in the hair dryer's circuit? Use the equation for Ohm'sLaw.

Answer 1

Given that the current in the hairdryer is I = 12 A.

The voltage applied is V = 120 V

We have to find electric resistance.

Let the resistance be denoted by R.

According to Ohm's law,

$\begin{gathered} V\propto I \\ V=RI \end{gathered}$

The formula to calculate resistance using Ohm's law is

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

Substituting the values, the electric resistance will be

$\begin{gathered} R=\frac{120}{12} \\ =10\Omega \end{gathered}$

Thus, the electric resistance of the hairdryer circuit is 10 ohm.