Discussion
What do the common-emitter input characteristics plot?
Answer: A
The input characteristics show base current against base-emitter voltage, and they look like an ordinary diode curve because that is what the input is. Collector current against collector voltage is the output family, and the direct current transfer is a third plot. Recognising that a transistor's input is simply a forward-biased junction explains why base voltage cannot be used to set the operating point with any precision. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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