9. An appliance has a resistance of 15.0 2. It uses 30.0 V, supplied by the secondary coil of a transformer. The transformer has 200 turns in its primary coil and is plugged into a 120-V source. Calculate (a) the number of turns in the secondary coil; (b) the current in the secondary coil; (c) the current in the primary coil.
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- 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?A 24.0 V battery is attached to a 0.180 m long solenoid with 2600 turns. It creates a 0.0705 T field. What is the resistance of the coil? (Hint: What is the current?) (Unit = Ohms)A plug-in transformer supplies 9.00 V to a video game system. (a) How many turns are in its secondary coil if its input voltage is 120 V and the primary coil has 423 turns? turns(b) What is its input current when its output is 1.33 A? A
- 100. The inductance of a closely packed coil of 400 turns is 8.0 mH. Calculate the magnetic flux through the coil when the current is 5.0 mA.Calculate the peak voltage of a generator that rotates its 215 turns, 0.100 m diameter coil at 3600 rpm in a 0.660 T field. _____VA 24.0 V battery is attached to a 0.180 m long solenoid with 2600 turns. It creates a 0.0705 I field. What is the resistance of the coil? (Hint: What is the current?) (Unit = Ohms)
- 7. A coil with a self-inductance of 2.0 H carries a current that varies with time according to I(t) = (2A) sin(120πt). Find an expression for the emf induced in the coil. This is not and will not be gradedA transformer has 90 turns on the primary coil and 175 turns on the secondary coil. If the AC input current is 5 A, the output current is Select one: O a. 2.6 A O b. 9.7 A O c. 3.5 A O d. 7.8 A