Answer:
The input (emitter) circuit of a transistor is always forward biased and the output (collector) circuit is reverse biased. Consequently, a smaller variation of input voltage produces a large variation in the input emitter current. This implies that the input resistance of a transistor is very low. The reverse biased collector collects all the charge carriers that diffuse into it through the base. Consequently, a very large change in the collector voltage produces only a small change in the collector current. This implies that the output resistance of the transistor is very high.
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