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

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

Options:

Correct Answer: 432000 Joules

Solution:

Energy consumed = Power × Time = 60 W × (2 × 3600 s) = 432000 J.

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

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

Step 1: Understand that power is measured in Watts (W), and 1 Watt is equal to 1 Joule per second (J/s).
Step 2: Identify the power of the light bulb, which is 60 Watts.
Step 3: Convert the time from hours to seconds. Since 1 hour is 3600 seconds, 2 hours is 2 × 3600 seconds.
Step 4: Calculate the total time in seconds: 2 × 3600 = 7200 seconds.
Step 5: Use the formula for energy consumed: Energy = Power × Time.
Step 6: Substitute the values into the formula: Energy = 60 W × 7200 s.
Step 7: Calculate the energy: 60 × 7200 = 432000 Joules.

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