Chapter 3, Problem 57E

Interpretation Introduction

Interpretation: The given energy used by the customer in kilowatt hours, $\text{kWh}$ should be converted into Joules.

Concept Introduction:

To convert a quantity, $a{u}_1$ from one unit to another i.e. $u_1\to u_2$ first write a conversion factor $\frac{u_2}{u_1}$.

Multiply the conversion factor with the given quantity $a{u}_1$ and cancelling units to get the desired quantity.

$a\cancel{u_1}\times \frac{u_2}{\cancel{u_1}}=a{u}_2$

The relation between $\text{kWh}$ and joule is given by:

$\text{1 kWh=3}{\text{.60×10}}^{\text{6}}\text{ J}$