This may seem like a really stupid question, but if I get a good, understandable answer I'll never have to ask it again. Why would a circuit breaker trip if you have an extension cord plugged into a compressor, but it won't trip when you plug it into the wall? It seems that the extension cord would create more resistance, and so less current would flow, (according to ohm's law), and the extension cord would heat up from the resistance, but the breaker wouldn't trip. I hear that the motor will draw the amperage it needs whether it's a high resistance or not, which seems to go against ohm's law, but I know that it must be true because the breaker does trip. Please help me to understand the reasoning behind it. Thank You very much.