A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?
A) $3.0 \mathrm {~kJ}$
B) $11 \mathrm { MJ }$
C) $1.5 \mathrm {~kJ}$
D) $0.18 \mathrm { MJ }$

Question

A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced? 
A) $3.0 \mathrm {~kJ}$
B) $11 \mathrm { MJ }$
C) $1.5 \mathrm {~kJ}$
D) $0.18 \mathrm { MJ }$

Quizplus · Accepted Answer

The heat energy produced can be calculated using the formula $E = P \times t$, where $E$ is the energy in joules, $P$ is the power in watts, and $t$ is the time in seconds. First, convert 2.0 hours to seconds: $2.0 \, \text{hours} = 2.0 \times 3600 \, \text{seconds} = 7200 \, \text{seconds}$. Then, calculate the energy: $E = 1500 \, \text{W} \times 7200 \, \text{s} = 10,800,000 \, \text{J} = 10.8 \, \text{MJ}$, which is closest to $11 \, \text{MJ}$.

A 1500-W Heater Is Connected to a 120-V Line for 2.0