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In a simple transistor amplifier the collector current (IC) is related to the base current (IB) by the formula:
hFE = IC/IB
where hFE is the current gain (in common emitter mode).
Thus, if a small current is applied to the base of a transistor, the collector current will be hFE times larger. For example, if hFE = 100 and IB = 1mA, IC will be 100 x 1mA or 100mA. This fundamental relationship is the basis of the transistor both when used as a switch and when used as an amplifier.
<^< Examples: Current Flow Model | Course index | Worksheet: Transistor as a Current Amplifier >^>
