AC Power in Purely Resistive Circuits Quiz

What is the primary focus of the video on AC power in resistive circuits?

• The relationship between voltage, current, and power

• The role of capacitors in AC circuits

• The use of transformers in AC circuits

• The impact of inductors on AC circuits

What does the waveform diagram in the video illustrate?

• The relationship between voltage, current, and power

• The effect of capacitors on AC circuits

• The impact of inductors on AC circuits

• The role of transformers in AC circuits

In a purely resistive circuit, what is the phase angle between voltage and current?

• 45 degrees

• 180 degrees

• 0 degrees

• 90 degrees

What is the significance of the phase angle being zero in resistive circuits?

• It shows that voltage and current are in phase

• It indicates that voltage and current are out of phase

• It means the circuit is not resistive

• It suggests the presence of inductors

How is average power calculated in a resistive circuit?

• By subtracting RMS current from RMS voltage

• By adding RMS voltage and RMS current

• By using RMS voltage and RMS current

• By multiplying peak voltage and peak current

What is the cosine of the phase angle in a purely resistive circuit?

• 0.5

• 0

• -1

• 1

Why is power always positive in a resistive circuit?

• Because power is calculated using peak values

• Because voltage and current are in phase

• Because power is always negative

• Because voltage and current are always positive

What happens to the power value during the third quarter cycle in a resistive circuit?

• It becomes positive

• It remains zero

• It becomes negative

• It fluctuates randomly

During which part of the cycle is the power value calculated as positive?

• During all quarter cycles

• Only during the second quarter cycle

• Only during the first quarter cycle

• Only during the last quarter cycle

What is the average power value in a resistive circuit?

• The maximum value of power

• The minimum value of power

• The value between the minimum and maximum

• The sum of maximum and minimum values