this is from the same set of pictures i took last journal, mainly because i cant find my camera right now. luckily, i took a picture of the dimmer switch for my fan. because the brigthness of the light and speed of the fan are directly related the strength of the current, you can control the level of light and fan speed by lowering the current. Current equals yoltage over resistance, so this can be acheieved through changing either factor. Dimmer switches work by changing the resistenace, the denominator of the equation. therefore, in order to dim the light, the switch must increase the resistance. this is done by moving one part of the circuit up and down a strip of resistant material. since resistance icreases with length of the wire, and the resistor in this case is short, the resistance of the switch must be comparatively high vs the rest of the circuit. and although it is hard to tell from these photos, those lights are actually different brightnesses.
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