A battery is joined to a bulb with two wires…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A battery is joined to a bulb with two wires.
- Which way does the conventional current go through the bulb?
- Which way do the electrons move?
- If we reverse the battery, does the bulb light any differently?
Need a reminder? The key ideaShow
Current is the charge passing each second: , in amperes (). One electron carries . The conventional current goes from to outside a cell; electrons drift the other way.
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. (a) From the terminal, through the bulb, to the terminal.
Step 2. (b) The other way: from round to .
Step 3. (c) No. The current reverses, but its size, and the heating of the filament, stay the same.
Answer: (a) to . (b) to . (c) No difference.
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