fluorescent lights

1. A strand of 150 miniature holiday lights will use ½ watt per bulb and has an in-line fuse rated at 4 amps.
a. How many strands of lights may be connected together end-to-end without burning the in-line fuse?

b. If you have a 120V–15 amp circuit with nothing else plugged into it other than the holiday lights, how many strands of 150 bulbs can be plugged in to one circuit?

2. A 120 V circuit has thirty 40W fluorescent lights.
a. What is the total amperage requirement for the circuit?

b. What is the total resistance of the circuit?

3. Dry human skin has about 100,000 ? of resistance. If your skin is dry and you make contact with a bare wire carrying 120V of electricity, how much current will actually pass through your body?

4. With wet skin, your body has about 1000 ? of resistance. How much shock could you get from a 7 Watt night light on a 120 V circuit?

5. An emergency backup battery pack stores power for a computer system. If the system requires 10 Amps to remain functional, how much charge is needed to run the system for 8 hours?

6. At $.12 per kilowatt-hour, what would it cost to light factory with 250—175 W bulbs for one shift (8 hours)? For one week (120 hours)? For a full year?

7. If ISU has 400 security lights around campus that each consume 175 watts of electricity and are on for an average of 12 hours each night, what does it cost to light the campus for a year? Assume $.11 per kilowatt-hour.

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