AP EAMCET · PHYSICS · Alternating Current

In an AC circuit \(V\) and \(I\) are given below, then find the power dissipated in the circuit
\(V=50 \sin (50 t) v I=50 \sin \left(50 t+\frac{\pi}{3}\right) \mathrm{mA}\)

A \(0.625\ W\)
B \(1.25\ W\)
C \(2.50\ W\)
D \(5.0\ W\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(0.625\ W\)

Step-by-step Solution

Detailed explanation

\(\mathrm{P}=\mathrm{E}_{\mathrm{rms}} \mathrm{V}_{\mathrm{rms}} \cos \theta=\frac{E_0 V_0}{2} \cos \phi\) So, \(\quad P=\frac{50 \times 50 \times 10^{-3} \times 1}{2 \times 2}=0.625 \mathrm{~W}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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In an AC circuit \(V\) and \(I\) are given below, then find the power dissipated in the circuit\(V=50 \sin (50 t) v I=50 \sin \left(50 t+\frac{\pi}{3}\right) \mathrm{mA}\)

Step-by-step Solution

In an AC circuit \(V\) and \(I\) are given below, then find the power dissipated in the circuit
\(V=50 \sin (50 t) v I=50 \sin \left(50 t+\frac{\pi}{3}\right) \mathrm{mA}\)