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The-Amplifier
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Controlling Current
 
Switch controls the Current to the Lamp: No Gain.
A small amount of current to the Relay controls a Larger amount of Current to the Lamp: Gain.



The Rheostat controls a Varying Current to the Lamp: No Gain.
 
A small amount of varying current to the Transistor controls a Larger amount of Current to the Lamp: Gain.
 
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