A standard light globe is rated at 20W and typically lasts for around 1000 hours. How much energy does it use in its lifetime?
Question
A standard light globe is rated at 20W and typically lasts for around 1000 hours. How much energy does it use in its lifetime?
Solution
To calculate the total energy used by the light globe in its lifetime, you need to multiply its power rating by its lifespan.
Step 1: Identify the power rating of the light globe. In this case, it is 20W (Watts).
Step 2: Identify the lifespan of the light globe. In this case, it is 1000 hours.
Step 3: Multiply the power rating by the lifespan to get the total energy used. Energy is typically measured in watt-hours (Wh) or kilowatt-hours (kWh).
Calculation: 20W * 1000 hours = 20,000 Wh or 20 kWh
So, a standard light globe rated at 20W uses 20,000 Wh or 20 kWh of energy in its lifetime of 1000 hours.
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