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

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.