Solve the problems below:
1. There is a light bulb in a 120. V circuit with a resistance of 100. ohms. What is the current through the bulb?
2. What is the weekly energy cost of leaving a 65 W bulb on for half the day if the electricity cost is $0.15 per kWh?
3. An electric motor draws a current of 12 A in a 240 V circuit. What is the power of this motor in W?
4. The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V.
(a) If there are 2400 loops on the primary coil, how many are on the secondary coil?
(b) What current does the transformer draw from the line if the current in the secondary is 24 A?
(c) What are the power input and output?