Nooooo... I just wrote a whole blog entry and then firefox froze on me... :( I get to write it again...
This cute little chick you see here (yes, he's cute, even though you can't see his eyes because he's unnaturally fluffy; if he was real, this might be a problem) is my brother's toy. He has two little metal contacts on the bottom. If you touch only one, nothing happens, but if you touch both, the little chick goes cheeep. Interestingly, if you touch one, get a friend to touch the other one, and touch your friend, it also goes cheep. This is because either way, you're completing a circuit. There are batteries inside the chick that provide a potential difference; here we'll assume that there are 3 button cell batteries, each with a voltage of 3 volts. They are connected in series, so you add their voltage, giving the circuit a total potential difference of 9 volts. If you pretend the speaker and circuit board have a resistance of 3 ohms, then you can calculate the current using V = IR as 3 amperes.
Ignore the fact that I took the picture of the chick on my brother's lap desk... :P
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