If a 1000 W heater runs for 2 hours, how much energy does it consume?

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Question: If a 1000 W heater runs for 2 hours, how much energy does it consume?

Options:

Correct Answer: 3600000 J

Solution:

Energy = Power × Time = 1000 W × (2 × 3600 s) = 7200000 J.

If a 1000 W heater runs for 2 hours, how much energy does it consume?

If a 1000 W heater runs for 2 hours, how much energy does it consume?

Step 1: Understand that the heater's power is 1000 W (watts). This means it uses 1000 joules of energy every second.
Step 2: Convert the time the heater runs from hours to seconds. Since 1 hour is 3600 seconds, 2 hours is 2 × 3600 = 7200 seconds.
Step 3: Use the formula for energy consumption, which is Energy = Power × Time.
Step 4: Substitute the values into the formula: Energy = 1000 W × 7200 s.
Step 5: Calculate the energy: 1000 × 7200 = 7200000 joules.

Power and Energy Relationship – Understanding that energy consumption can be calculated by multiplying power (in watts) by time (in seconds).
Unit Conversion – Converting hours to seconds to ensure consistent units when calculating energy.