# Working with Energy Conversion Efficiency

Please refer to the attached file. It contains more than one-page.

Please answer at least TWO multiple-choices questions. Explain in-detail why such answers are chosen.

It is difficult to answer these non-assignment multiple-choices questions. Please help to work out the detailed step-by-step answers to these non-assignment multiple-choices questions. The detailed step-by-step answers will be helpful for understanding the context of the subject.

Please be reminded to answer at least TWO multiple-choices questions.

Â© BrainMass Inc. brainmass.com March 4, 2021, 6:34 pm ad1c9bdddfhttps://brainmass.com/physics/torques/working-with-energy-conversion-efficiency-51163

#### Solution Preview

1. The instantaneous power waveform has frequency which is twice that of the source, This is because the E*I product gives a sine-squared function which is at twice the frequency of the original sine waves. But this is true only for a resistive circuit. So the answer is C.

In other cases, the current will lag or lead the applied voltage and the power waveform will be a cosine wave with frequency at twice the source frequency.

Instantaneous Power = E ...

#### Solution Summary

Solution with all explanations and mathematical steps.