A small transformer used for a doorbell steps down the voltage from 120 V and 0.5 A to 12 V. What is the current fl ow to the doorbell? Ten megawatts of electricity is to be transmitted over a power line of resistance 4 ohms. a. If the electricity is generated at 10,000 V and is to be transmitted at 130,000 V, what should be the ratio of turns of the transformer? b. At what current will the power be transmitted? c. What percentage of the original power will be lost in the line because of resistive heating?
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