Question

Your electric bill lists the rate in units of dollars per kilowatt-hour (kW-h). On a winter day, you use a space heater to heat your bedroom for 30 minutes. If the power used by the space heater is 1000 W, then what is the energy consumed?

Answer 1

To calculate the energy consumed by the space heater, multiply the power in kilowatts by the time in hours. In this case, the energy consumed is 0.5 kilowatt-hours.

Step-by-step explanation:

To calculate the energy consumed by the space heater, you need to use the formula E = Pt, where E is the energy in kilowatt-hours (kWh), P is the power in kilowatts (kW), and t is the time in hours. In this case, the power used by the space heater is 1000 W, which is equivalent to 1 kW, and the time is 30 minutes, or 0.5 hours.

So, E = 1 kW × 0.5 hours = 0.5 kWh. Therefore, the energy consumed by the space heater is 0.5 kilowatt-hours.