How do you compute true power (power...

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Question 1 of 20RGjZSnYlFE0G3obs3Y1r

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?

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Question 1 of 20

RGjZSnYlFE0G3obs3Y1r

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?

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🔍 Key Concepts

• Apparent power (S) vs true (real) power (P) vs reactive power (Q) in AC circuits • Meaning of power factor (PF) and its relationship to phase angle between voltage and current • How to compute apparent power from RMS voltage and RMS current

💭 Think About

• First figure out which quantity is directly given by multiplying RMS voltage and RMS current: is that true power or something else? • Think about what power factor numerically represents in an AC circuit: is it a ratio, a difference, or a product? • Ask yourself: once you know apparent power and power factor, how would you combine them to get just the portion of power that is actually dissipated (not just circulating)?

✅ Before You Answer

• Confirm that apparent power S is measured in volt-amperes (VA) and equals Vrms × Irms • Recall that power factor = cos(φ), where φ is the phase angle between voltage and current, and that true power P is always less than or equal to apparent power S in an inductive or capacitive circuit • Eliminate any choice that would give you a value larger than apparent power when PF is less than 1, because true power cannot exceed apparent power

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Question 1 of 20RGjZSnYlFE0G3obs3Y1r

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?

Back

Question 1 of 20

RGjZSnYlFE0G3obs3Y1r

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed