(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Calculate the power transferred when Vi(t) = 50 cos (4π 10t) in the attached figure.

2. Relevant equations

P(load) = |V(load rms)||I(load rms)|cos(phase(V)-phase(I))

The solution must be P(load) = 3.82 W.

3. The attempt at a solution

I've calculated the Thevenin equivalent of the circuit outside the load. Vth = 27.1<12.5º and Zth = 12.1<75.96º.

I've also calculated Zload = 50 Ω approximately.

V(load rms) is obtained by the voltage divisor. I got about 17.7<0º and I(load rms) = V(load rms)/Z(load) = 0.353<0º.

So, using the formula in section 2., P(load) = 6.24 W, which is not the correct result.

Where have I made a mistake?

Thank you.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Power transferred to load

Have something to add?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**