When a positive voltage signal is applie...

When a positive voltage signal is applied to the base of a common emitter `npn` amplifier

The emitter current decreases

The collector voltage becomes more positive

The collector voltage becomes less positive

The collector current decreases

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Common emitter amplifier

Draw the circuit diagram of a common emitter amplifier using n-p-n transistor. What is the phase difference between the input signal and output voltage? State two reasons why a common emitter amplifier is preferred to a common base amplifier.

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An NPN transistor is used in common emitter configuration as an amplifier with 1 k Omega load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15 mu A change in the base current of the amplifier. The input resistance and voltage gain are:

A transistor is used in common emitter mode as an amplifier. Then (1) the base-emitter junction is forward biased (2) the base emitter junction is reverse biased (3) the input signal is connected in series with the voltage applied to the base-emitter junction. (4) the input signal is connected in series with the voltage applied to the base collector junction.

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npn transistors are preferred to pnp transistors because they have
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