Practice # 9 Semiconductors

Front

What does a half-wave rectifier allow current to pass through during each cycle?

Back

The positive alternation.

Front

What is the schematic symbol for a fixed resistor?

Back

A rectangle.

Front

What are the three leads of a transistor?

Back

Emitter, Base, Collector.

Front

What type of diodes are designed to break down and allow current to pass when the circuit potential is equal to or exceeds the desired reverse bias voltage?

Back

Zener diodes.

Front

What is a variable-capacitance diode commonly referred to as?

Back

Varactor.

Front

What is the primary function of a half-wave rectifier?

Back

To convert alternating current (AC) to direct current (DC) by allowing only one half of the AC waveform to pass.

Front

What is the difference between a half-wave rectifier and a full-wave rectifier?

Back

A half-wave rectifier allows current to pass during only one half of the AC cycle, while a full-wave rectifier allows current to pass during both halves.

Front

What is the role of the emitter in a transistor?

Back

To emit charge carriers (electrons or holes) into the base.

Front

What is the purpose of a Zener diode in a circuit?

Back

To provide voltage regulation by allowing current to flow in the reverse direction when a specific reverse voltage is reached.

Front

How does a varactor diode function in a circuit?

Back

It varies its capacitance based on the voltage applied across it.