1. An ac generator operates at a frequency of 60 Hz. If the output voltage is a

Question

1. An ac generator operates at a frequency of 60 Hz. If the output voltage is a maximum (in magnitude) at t=0, when is it next (a) a maximum (in magnitude), (b) zero (c) at its initial value?

Answers are: (a) 1/120s (b) 1/240s (c) 1/60s

Please fully explain how to do this problem and any forumla used

2. A 60-Hz ac voltage source has a maximum voltage of 120 V. A student wants to determine the voltage 1/180s after it is zero. (a) how many possible voltages are there? (b) Determine all possible voltages

Answers are: (a) 2 (b) +/-104V

Again I have no idea how to do this one either so please fully explain and please show formula and steps. (I've been using E=(NBAw) sin wt

Explanation / Answer

1 The generator will be at a maximum every half cycle, so in 1/120 s from t=0 it will be at it's next maximum.

2

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