Chapter 6.3, Problem 22PP

To determine

To calculate: Electrical energy used by the hair dryer.

Answer to Problem 22PP

Electrical energy used by the hair dryer is $\underset{\_}{\text{0}\text{.06 kWh}}$ .

Explanation of Solution

Given:

Time = $\text{3 minutes}$

Power = $1200\text{ W}$

Formula used:

Electrical energy is given by,

  $E=Pt$

where $P$ is power and $t$ is time.

Calculation:

Electrical energy is calculated as:

  $\begin{array}{l}E=Pt\\ =(1200\text{ W})(3\text{ minutes})\\ =\left(\frac{1200}{1000}\text{ W}\right)\left(\frac{3}{60}\text{ h}\right)\\ =(1.2\text{ kW)(0}\text{.05 h)}\\ \text{ = 0}\text{.06 kWh}\end{array}$

Conclusion:

Electrical energy used by the hair dryer is $\underset{\_}{\text{0}\text{.06 kWh}}$ .