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15
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Which type of component alternately stores and returns energy in the form of a magnetic field?
Inductor
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15
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Which formula correctly represents true power using RMS values?
P = VRMS × IRMS
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15
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What does a power factor of 1 indicate about a circuit?
That all the power is being used effectively — no reactive component
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15
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How does the frequency affect inductive reactance?
It increases — XL is proportional to frequency.
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15
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In resistive circuits, power is always:
• Positive
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15
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Define ‘apparent power’ and state its unit.
Apparent power is the vector sum of true and reactive power, measured in VA (Volt-Amps).
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lifesaver
Give 25 points!
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star
Double points!
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gift
Win 20 points!
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baam
Lose 10 points!
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15
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What type of power is associated with energy returned to the source?
Reactive Power
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banana
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gift
Win 15 points!
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gift
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banana
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15
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How is instantaneous power calculated in AC circuits?
p(t) = v(t) × i(t)
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15
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In an inductive circuit, does current lead or lag voltage?
Lag
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15
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What is the formula for calculating reactive power using current and reactance?
Q = I² × X (or Q = V² / X
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15
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Why does a pure inductor not dissipate power as heat?
Because an ideal inductor stores energy in its magnetic field and returns it to the source
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15
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What is the average true power in a purely inductive AC circuit?
Zero
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boom
Lose 50 points!
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fairy
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25
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rocket
Go to first place!
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lifesaver
Give 15 points!
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15
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Explain why the power waveform in AC circuits has twice the frequency of voltage/current.
Because both current and voltage are sinusoidal and their product results in a sine-squared waveform.
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