A 1000 W heater operates for 2 hours. How much energy does it consume?

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Question: A 1000 W heater operates for 2 hours. How much energy does it consume?

Options:

Correct Answer: 3600000 J

Solution:

Energy consumed can be calculated using E = P * t. Here, P = 1000 W and t = 2 hours = 7200 seconds. Thus, E = 1000 W * 7200 s = 7200000 J.

A 1000 W heater operates for 2 hours. How much energy does it consume?

A 1000 W heater operates for 2 hours. How much energy does it consume?

Step 1: Identify the power of the heater, which is given as 1000 W (watts).
Step 2: Identify the time the heater operates, which is given as 2 hours.
Step 3: Convert the time from hours to seconds because the power is in watts (1 hour = 3600 seconds). So, 2 hours = 2 * 3600 = 7200 seconds.
Step 4: Use the formula for energy consumed, which is E = P * t, where E is energy, P is power, and t is time.
Step 5: Substitute the values into the formula: E = 1000 W * 7200 s.
Step 6: Calculate the energy: E = 1000 * 7200 = 7200000 J (joules).

Power and Energy Relationship – Understanding the relationship between power (in watts) and energy (in joules) through the formula E = P * t.
Unit Conversion – Converting time from hours to seconds to ensure consistency in units when calculating energy.