6. Your 60-watt light bulb is plugged into a 110-volt household outlet and left on for 3 hours. The utility company charges you $0.11 per kiloWatt•hr. Calculate the cost of such a mistake

0.0198 dollars

Explanation:

We first obtain the total energy drawn by the light bulb in kilowatt-hour (kW-hr) using the following relationship;

Energy = power rating x time

Given;

power rating = 60W,

time = 3hrs

Therefore,

Energy consumed = 60W x 3hr

Energy consumed = 180W-hr = 0.18kW-hr

We then multiply this energy in kW-hr by he amount charged per unit kW-hr as follows;

Given that 1kW-hr = 0.11 dollars

0.18kW-hr = 0.18 x 0.11

= 0.0198 dollars