Chapter 35, Problem 21A

Calculate the current in a 12-V battery that powers a single $30\text{-}\Omega$ resistor.

To determine

The current in the battery.

Answer to Problem 21A

The current through the battery is $0.4\text{A}$ .

Explanation of Solution

Given info:

Voltage across the battery, $V=12\text{V}$

Resistance of the resistor, $R=30\Omega$

Formula used:

The expression to calculate the current in the battery using Ohm’s law is,

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

Calculation:

Substitute given values in the above expression.

$\begin{array}{c}I=\frac{12\text{V}}{30\Omega }\\ =0.4\text{A}\end{array}$

Conclusion:

The current through the battery is $0.4\text{A}$ .