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A 1000 W heater operates for 3 hours. How much energy does it consume?

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Question: A 1000 W heater operates for 3 hours. How much energy does it consume?

Options:

  1. 3000 J
  2. 1080000 J
  3. 3600000 J
  4. 1000 J

Correct Answer: 3600000 J

Solution: 

Energy consumed is E = P * t. Here, P = 1000 W and t = 3 hours = 10800 seconds. Thus, E = 1000 W * 10800 s = 10800000 J.

A 1000 W heater operates for 3 hours. How much energy does it consume?

Practice Questions

Q1
A 1000 W heater operates for 3 hours. How much energy does it consume?
  1. 3000 J
  2. 1080000 J
  3. 3600000 J
  4. 1000 J

Questions & Step-by-Step Solutions

A 1000 W heater operates for 3 hours. How much energy does it consume?
Correct Answer: 10800000 J
  • Step 1: Identify the power of the heater. The power (P) is given as 1000 W (watts).
  • Step 2: Identify the time the heater operates. The time (t) is given as 3 hours.
  • Step 3: Convert the time from hours to seconds. Since 1 hour = 3600 seconds, multiply 3 hours by 3600 seconds/hour: 3 * 3600 = 10800 seconds.
  • Step 4: Use the formula for energy consumed, which is E = P * t. Substitute the values: E = 1000 W * 10800 s.
  • Step 5: Calculate the energy consumed. Multiply 1000 by 10800 to get E = 10800000 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.
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