A semiconductor that controls the flow of electricity in a circuit. Usually made of germanium or silicon.This electrical device can amplify a signal.Amplify current.e.g. they can be used to amplify the small output current from a logic chip so it can operate a lamp, relay, or other high-current device

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1. A semiconductor that controls the flow of electricity in a circuit. Usually made of germanium or silicon.
This electrical device can amplify a signal.

Amplify current.
e.g. they can be used to amplify the small output current from a logic chip so it can operate a lamp, relay, or other high-current device