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RE: help needed brain exploded ...electrical
Posted by : James - Edinburgh- (2.121.0.203) 
Inappropriate or SPAM?
On Sunday 20/05/12 at 16:08:31
It can be useful to think of electricity like plumbing. Voltage (V) is the pressure forcing the water to flow, Current (I) is the rate of water flow, Resistance (R) is a narrowing of the pipe which slows down the rate of water flow.
A diode (rectifier) is a one way valve whilst a bridge (full wave) rectifier is two valves in parallel, one allowing positive pressure flow and the other allowing negative pressure flow allowing the push/pull flow that Ric mentions.
A capacitor acts like a rubber membrane sealing the pipe stopping direct water flow but allowing the push/pull of a continuously changing pressure ie blocks DC but passes AC.
Ohms law states V=IR, using the plumbing analogy this means that for a given water pressure (V) decreasing the pipe diameter(increasing R) will give a reduced water flow rate (I decreases)
Hope that helps someone.
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