Transformers (cont.)
Part E- The primary coil of a transformer has 200 turns and the secondary coil has 800 turns. The power supplied to the primary coil is 400 watts. What is the power generated in the secondary coil if it is terminated by a 20-ohm resistor?
| 20W |
| 200W |
| 400W |
| 800W |
| 8000W |
| 16000W |
| 32000W |
Part F- A transformer supplies 60 watts of power to a device that is rated at 20 volts. The primary coil is connected to a 120-volt ac source. What is the current I_1 in the primary coil?
(Express answer in terms of amperes.)
Part G- The voltage and the current in the primary coil of a nonideal transformer are 120 volts and 2.0 amperes. The voltage and the current in the secondary coil are 19.4 volts and 11.8 amperes. What is the efficiency eee of the transformer? The efficiency of a transformer is defined as the ratio of the output power to the input power, expressed as a percentage: e=100Pout/Pine=100Pout/Pin.
(Express answer as a percentage.)
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