Chapter 6, Problem 54R

To determine

To calculate: the power of the calculator.

Answer to Problem 54R

The power of the calculator is $\underset{\_}{\text{0}\text{.9 W}}$ .

Explanation of Solution

Given data:

Voltage difference across the calculator, $V=9\text{ V}$

Current, $I=0.1\text{ A}$

Formula used:

Electrical Power Equation:

  $P=IV$

Where $P$ is the power of a device in watts, $I$ is the current through the device in amperes, and $V$ is the voltage difference across the device in volts.

Calculation:

As per the problem,

  $\begin{array}{l}V=9\text{ V}\\ I=0.1\text{ A}\end{array}$

Substitute the values of current and voltage difference in the electrical power equation:

  $\begin{array}{l}P=IV\\ P=(0.1\text{ A)(9 V)}\\ P=0.9\text{W}\end{array}$

Conclusion:

The power of the calculator is $\underset{\_}{\text{0}\text{.9 W}}$ .