How Diodes Work

Why is copper commonly used for electrical wires?

• It is cheaper than other metals.

• It is lightweight.

• It has a lot of free electrons.

• It is a good insulator.

What is the main reason rubber is used to insulate wires?

• It is a conductor.

• It is flexible.

• Its electrons are tightly held.

• It is waterproof.

In a metal conductor, what is the relationship between the conduction band and the valence shell?

• They overlap.

• They are far apart.

• They are the same.

• They repel each other.

What happens to a semiconductor when it is doped?

• It becomes a perfect insulator.

• It becomes a metal.

• It changes its electrical properties.

• It loses all its electrons.

What is created at the PN junction in a diode?

• A magnetic field.

• A light emission.

• A depletion region.

• A thermal gradient.

What condition is necessary for a diode to conduct current in forward bias?

• The voltage source must be negative.

• The voltage source must be greater than 0.7 volts.

• The voltage source must be less than 0.7 volts.

• The voltage source must be exactly 0.7 volts.

What happens when a diode is in reverse bias?

• It allows current to flow.

• It acts as a conductor.

• It acts as an insulator.

• It emits light.