![]() ![]() Okay! So let's calculate the input current. The question is what is the output power and the input current? So the output power is going to be 120 watts just as the input power is because with perfect efficiency, we should expect there to be no power loss and there's no way this could be more because that would require energy to be spontaneously created somehow and conservation of energy is the principle that you can't have a greater rate of energy production out than you have the rate of energy input. An ideal step-up transformer has perfect efficiency and that's what ideal means, it has a turn ratio of 1 to 30 so the number of turns in the primary divided by number of turns in the secondary is 1 over 30 in other words, it's supplied with an input power of 120 watts so we'll call that P P for primary so the input side of the transformer is the primary side-120 watts there- and the output voltage is 210 volts so voltage in the secondary, in other words, is 210 volts. This is College Physics Answers with Shaun Dychko.
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