A 2000 W heater operates for 3 hours. How much energy does it consume in kilowat
Practice Questions
Q1
A 2000 W heater operates for 3 hours. How much energy does it consume in kilowatt-hours?
6 kWh
5 kWh
4 kWh
3 kWh
Questions & Step-by-Step Solutions
A 2000 W heater operates for 3 hours. How much energy does it consume in kilowatt-hours?
Correct Answer: 6 kWh
Step 1: Identify the power of the heater, which is given as 2000 W.
Step 2: Convert the power from watts to kilowatts. Since 1 kW = 1000 W, divide 2000 W by 1000. This gives you 2 kW.
Step 3: Identify the time the heater operates, which is given as 3 hours.
Step 4: Use the formula for energy consumed, which is E = P * t, where E is energy, P is power in kilowatts, and t is time in hours.
Step 5: Substitute the values into the formula: E = 2 kW * 3 hours.
Step 6: Calculate the energy consumed: 2 kW * 3 hours = 6 kWh.
Power and Energy Conversion – Understanding the relationship between power (in watts or kilowatts) and energy (in kilowatt-hours) and how to convert between these units.
Time Duration in Energy Calculations – Recognizing the importance of time duration in calculating energy consumption.
