Ch 26

32. A power pack charging a cell phone battery has an output of0.4 A at 5.2 V, both rms. If the power pack is plugged into a 120 Vwall socket, what is the rms current? 17.3 mA

33. A neon sign transformer has a 450 Watt AC output with an rmsvoltage of 15kV when connected to a normal household outlet. Thereare 500 turns of wire in the primary cell.

a) How many turns of wire are in the secondary coil? 62,500turns

b) When the transformer is running full power. What is thecurrent in the secondary coil? 30 mA

c) When the transformer is running full power. What is thecurrent in the primary coil? 3.75 A

34. A generator produces 250 kW of electric power at 7.2 kV. Thecurrent is transmitted to a remote location through wires with atotal resistance of 15 W.

a) What is the power loss due to the resistance in the wires? 18kW

b) What is the power loss if the voltage increased to 30 kV? 1kW

35. A 20 µF capacitor is connected across an AC generator thatproduces a peak voltage 6 Volts. The peak current is 0.2 A. What isthe oscillation frequency in Hz? 265 Hz

36. A 500 µH inductor is connected across an AC generator thatproduces a 3.5 V rms Voltage. What is the frequency if the peakcurrent is 50 mA? 31.5 kHz

37. An FM radio station broadcasts at a frequency of 103.5 MHz.What inductance should be paired with a 10 pF capacitor to build areceiver circuit for this station? 236 nH