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A light bulb uses 60 W of power. How much energy does it consume in 2 hours?

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Question: A light bulb uses 60 W of power. How much energy does it consume in 2 hours?

Options:

  1. 120 J
  2. 7200 J
  3. 432000 J
  4. 360 J

Correct Answer: 432000 J

Solution: 

Energy consumed can be calculated using E = P * t. Here, P = 60 W and t = 2 hours = 7200 seconds. Thus, E = 60 W * 7200 s = 432000 J.

A light bulb uses 60 W of power. How much energy does it consume in 2 hours?

Practice Questions

Q1
A light bulb uses 60 W of power. How much energy does it consume in 2 hours?
  1. 120 J
  2. 7200 J
  3. 432000 J
  4. 360 J

Questions & Step-by-Step Solutions

A light bulb uses 60 W of power. How much energy does it consume in 2 hours?
Correct Answer: 432000 J
  • Step 1: Understand that power (P) is the rate at which energy is used. In this case, the light bulb uses 60 watts (W) of power.
  • Step 2: Know that energy (E) can be calculated using the formula E = P * t, where E is energy, P is power, and t is time.
  • Step 3: Convert the time from hours to seconds because power is in watts (which is joules per second). 2 hours = 2 * 60 minutes/hour * 60 seconds/minute = 7200 seconds.
  • Step 4: Substitute the values into the formula: E = 60 W * 7200 s.
  • Step 5: Calculate the energy: E = 60 * 7200 = 432000 joules (J).
  • 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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