Questions: The daily cost of keeping lit a 150-watt light bulb for 10 hours each day is (Round to three decimal places as needed.)

Solution Steps

First, we need to calculate the energy consumption of the 150-watt light bulb over 10 hours. The power consumption in kilowatt-hours (kWh) is given by:

\[ \text{Energy (kWh)} = \text{Power (kW)} \times \text{Time (hours)} \]

Since 1 watt = 0.001 kilowatts, a 150-watt light bulb is:

\[ 150 \, \text{W} = 0.150 \, \text{kW} \]

Thus, the energy consumption for 10 hours is:

\[ \text{Energy} = 0.150 \, \text{kW} \times 10 \, \text{hours} = 1.5 \, \text{kWh} \]

Assume the cost of electricity is $\$0.12$ per kWh (this is a typical value, but it can vary).

Now, we calculate the daily cost of keeping the light bulb lit for 10 hours:

\[ \text{Daily Cost} = \text{Energy (kWh)} \times \text{Cost per kWh} \]

Substituting the values:

\[ \text{Daily Cost} = 1.5 \, \text{kWh} \times 0.12 \, \text{\$/kWh} = 0.18 \, \text{\$} \]

Final Answer