# How to Calculate α (alpha) of a Transistor

**α (Alpha)**, the factor by which emitter current is multiplied to yield collector current, can be calculated in two
ways.

**1st Way to Calculate Alpha α**

If the β of the transistor is known, α can be calculated very easily by the formula:

**Example**

If β of a transistor is 100, calculate the α of the transistor:

**2nd Way to Calculate Alpha α**

If the collector current, Ic, and the emitter current, Ie, are known, then α can be calculated by the following formula:

**Example**

If the collector current Ic= 7.95ma and the emitter current Ie=8ma, then alpha calculates out to be:

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