ExpIain why the input resistance of a transistor is Iow whiIe the output resistance is high.

Explanation

While using a transistor the emitter -base junction is always forward biased and the collector-base junction is reverse biased. For this reason a small charge in emitter voltage produces a large emitter current. This means a small variation of the input voltage produces a large variation in the emitter current. This implies that the input resistance of the transistor is small. On the other hand the collector being reverse biased collects all the charge carriers that enter it through the base. So a very large change in the collector voltage produces a very small chage in the collector current. This implies that the output resistance of the transistor is very high.