Power in an AC circuit is given by
Correct answer: B. P=VIcos
- A. P = VI
- B. P=VIcos
- C. P=VIsin(θ)
- D. P=VItan(θ)
Explanation
In an AC circuit, the real power (P) is given by the product of voltage (V), current (I), and the power factor (cosine of the phase angle between voltage and current, θ). Therefore, the correct expression for power in an AC circuit is P=VIcos(θ).
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
Practise Alternating Current
592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Alternating Current questions
In the case of an R.C series circuitser
In R.L series circuit with an increase in frequency of A.C source, the impedance of the circuit
As the charging potential alternates, the charge on the antenna
In a three-phase AC supply, the P.D across two live wires is
In alternating current the average value of current in cycle is:
In L.C.R series A.C circuit, the phase angle between current and voltage is: