Understanding AC and DC Currents

What is the primary difference between AC and DC currents?

• AC current flows in one direction only.

• DC current changes direction periodically.

• DC current has no direction.

• AC current changes direction periodically.

Which of the following best describes Direct Current (DC)?

• It fluctuates randomly.

• It moves in both forward and backward directions.

• It moves in a single, consistent direction.

• It has no specific direction.

In the context of DC current, what does 'polarity' refer to?

• The speed of the current.

• The direction of the current flow.

• The voltage level of the current.

• The type of material used in the circuit.

How does an electron behave in an AC circuit?

• It remains stationary.

• It moves in a circular path.

• It moves back and forth between two points.

• It moves in one direction only.

What is a key characteristic of AC current?

• It has a constant polarity.

• It completes cycles by changing direction.

• It is always more powerful than DC.

• It only flows in one direction.

Which statement correctly summarizes the difference between DC and AC currents?

• Both DC and AC are uniform.

• DC is uniform and flows in one direction, while AC is non-uniform and changes direction.

• Both DC and AC change direction.

• DC is non-uniform, while AC is uniform.

What happens to the polarity in an AC circuit?

• It remains constant.

• It is always negative.

• It changes instantly.

• It is always positive.

What does a frequency of 50 Hz in an AC circuit indicate?

• The current changes direction 50 times per second.

• The current changes direction 100 times per second.

• The current is stationary.

• The current flows in one direction 50 times per second.

Why does DC current have polarity?

• Because it flows in a consistent direction.

• Because it is non-uniform.

• Because it changes direction.

• Because it has a high frequency.

How is DC current graphically represented compared to AC current?

• Both are represented as straight lines.

• Both are represented as fluctuating lines.

• DC is a straight line, AC is a fluctuating line.

• DC is a fluctuating line, AC is a straight line.