A heater of 1250 W works for 2 hours. How many units does it use? How many joules is this?
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A heater of works for hours. How many units does it use? How many joules is this?
Need a reminder? The key ideaShow
Energy . One unit is : units power in kW time in hours. Cost units price of one unit.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Units. .
Step 2. Joules. .
Answer: units, which is .
Check. .
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