Question

A transistor has a β_DC of 60 and a base current, I_B, of 20 µA. The collector current, I_C, equals
1. 0.3 µA
2. 1200 µA
3. 1220 µA
4. 120 µA

Answer 1

Correct Answer - Option 2 : 1200 µA

Concept:

For a transistor, the base current, the emitter current, and the collector current are related as:

IE = IB + IC

where IC = βdc IB

βdc = Current gain of the transistor

Calculation:

Given IB = 20 μA and βdc = 60.

The collector current will be:

IC = 60 × 20 μA

IC = 1200 μA

Note: In milliAmpere, we get:

IC = 1200 × 10-6 A

IC = 1.2 × 10-3 A

IC = 1.2 mA