AC Circuit Behavior and Diode Resistance

The video tutorial explains the behavior of an AC circuit with diodes and a switch. It covers the basics of AC current flow, diode biasing, and how these affect the lighting of bulbs in the circuit. Two scenarios are analyzed: one with the switch open and another with it closed, demonstrating how current paths and bulb brightness change.

What happens to the direction of current flow in an AC circuit?

• It flows in one direction only.

• It alternates between clockwise and anti-clockwise.

• It flows randomly.

• It does not flow at all.

What is the resistance of a diode when it is forward biased?

• Infinite

• Very high

• Zero

• Very low

What is the state of the diode when it is reverse biased?

• No resistance

• High resistance

• Negative resistance

• Low resistance

How does a light bulb behave in an AC circuit?

• It explodes.

• It does not light up at all.

• It flickers due to alternating current.

• It stays continuously bright.

What is the primary reason for a bulb flickering in an AC circuit?

• Excessive current flow

• No current flow

• Alternating current flow

• Constant current flow

When the switch is open, what happens to the current flow in the circuit?

• Current flows only through the diodes.

• Current flows only through the bulbs.

• No current flows through the open circuit.

• Current flows through all paths.

In the open switch scenario, which bulb lights up when the current flows anti-clockwise?

• Both L1 and L2

• Only L1

• Neither L1 nor L2

• Only L2

What is the effect of closing the switch on the circuit's resistance?

• Makes the resistance infinite

• Decreases the resistance

• Increases the resistance

• No effect on resistance

When the switch is closed, which bulb lights up when the current flows clockwise?

• Neither L1 nor L2

• Only L2

• Only L1

• Both L1 and L2

In the closed switch scenario, which bulb lights up when the current flows anti-clockwise?

• Only L2

• Neither L1 nor L2

• Both L1 and L2

• Only L1