A 120V e.m.f is across a transformer's 200-turn primary coil. How many turns should a secondary coil have in order to produce a 30V e.m.f?
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A 120V e.m.f is across a transformer's 200-turn primary coil. How many turns should a secondary coil have in order to produce a 30V e.m.f?
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- A 140 V emf is across a transformer's 190-turn primary coil. How many turns should the secondary have in order to produce a 40 V emf, expressed as an integer. Can you set up Es/Ep = Ns/Np. I know I am to solve for Ns. I need to see what is given tied to the symbols, then I see what to what better.X2. A transmission line that has a resistance per unit length of 4.50x10−4 /m is to be used to transmit5.00 MW across 400 mi (6.44x105 m). The output voltage of the source is 4.50 kV. (a) What is the lineloss if a transformer is used to step up the voltage to 500 kV? (b) What fraction of the input power is lostto the line under these circumstances? (c) What If? What difficulties would be encountered in attemptingto transmit the 5.00 MW at the source voltage of 4.50 kV?In a well-designed transformer with an iron core, the secondary coil has twice as many turns as the primary coil. Which one of the followi statements concerning this transformer is true? OA This is a step-down transformer because the current in the secondary coil is less than that in the primary coll. OB The effect of the iron core is to reduce the magnetic field passing through the coils. C The induced emf generated in the secondary coil is twice as large as that generated in the primary coil. 9:44 PM O D. The flux that passes through each turn of the primary coil is twice the flux that passes through the secondary coil.