III.- solve the (“Parallel Exercises, Group B”) problems below:
6.- There is a current of 0.830 A through a lightbulb in a 120. V circuit. What is the resistance of this lightbulb?
10.- What is the monthly energy cost of leaving a 60 W bulb on continuously if the electricity cost is $0.10 per kWh?
11.- An electric motor draws a current of 11.5 A in a 240 V circuit. What is the power of this motor in W?
15.- The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V. (a) If there are 125 loops on the secondary, how many are on the primary coil? (b) What current does the transformer draw from the line if the current in the secondary is 36 A? (c) What are the power input and output?
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