A heater is marked 1320 W for a 220 V supply…
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 is marked for a supply. Find the current it takes, and the resistance of its coil.
Need a reminder? The key ideaShow
Joule's law: . Power , in watts. A fuse, in the live wire, melts when the current is too large.
The worked solution
Have you tried it?
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. Current. .
Step 2. Resistance. .
Answer: and .
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