Chapter 10, Problem 3PC

Calculate how much current warms your feet from electric shocks that have a $90\text{-}\Omega$ heating element powered by a 9-V battery.

To determine

The current that warms a person’s feet from electric shocks.

Answer to Problem 3PC

The amount of current to warms a person’s feet is $0.1\text{A}$.

Explanation of Solution

Given info: The resistance of the heating element is $90\Omega$ and the voltage supply from battery is $9\text{V}$.

Write the expression for the current.

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

Here,

$V$ is voltage supply

$R$ is resistance of heating element

Substitute $90\Omega$ for $R$ and 9 V for $V$ in the above expression to get $I$.

$\begin{array}{c}I=\frac{9\text{V}}{90\Omega }\\ =0.1\text{A}\end{array}$

Conclusion:

Therefore, the amount of current to warms a person’s feet is $0.1\text{A}$.