Understanding AC and DC

What does DC stand for?

• Dynamic Circuit

• Direct Current

• Dynamic Current

• Direct Circuit

What does AC stand for?

• Automatic Current

• Automatic Circuit

• Alternating Current

• Alternating Circuit

Can the terms AC and DC be used to describe both voltage and current?

• Yes, but only in specific conditions

• No, only for voltage

• No, only for current

• Yes, for both

What is a characteristic of DC voltage?

• It fluctuates over time.

• It changes direction.

• It is used in AC sockets.

• It remains steady.

What happens when the polarity of a battery is reversed?

• The battery charges itself.

• The voltage doubles.

• The current flows in the opposite direction.

• The current stops flowing.

How does an AC voltage source affect a light bulb?

• It dims and brightens as voltage changes.

• It stays constantly bright.

• It only gets brighter over time.

• It does not affect the light bulb.

What unit is used to measure frequency?

• Watts

• Hertz

• Volts

• Amps

How often do incandescent bulbs flash in a second at 50 Hz?

• 50 times

• 60 times

• 120 times

• 100 times

What effect does the frequency of AC have on incandescent bulbs?

• It increases their brightness.

• It causes them to flash rapidly.

• It decreases their lifespan.

• It has no effect.

What is the main difference between AC and DC current flow?

• DC cannot be converted to AC

• AC can only be used in batteries

• DC flows faster than AC

• AC flows in multiple directions, DC in one