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Electrical Engineering

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Jan 9, 2024

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Name: _______________________________________________________________Date: _________________________Block:___ Calculating Power, Energy & Cost For the problems below, be sure to show ALL your work including the formula and final units. 1. A 6-volt battery produces a current of 0.5 amps. What is the power in the circuit? 2. A 100-watt light bulb is operating on 1.2 amperes of current. What is the voltage ? 3. A potential difference of 120 volts is operating on a 500-watt microwave oven. What is the current being used? 4. A light bulb uses 0.625 amperes from a source of 120 volts. How much power is used by the bulb? 5. What voltage is necessary to run a 500-watt motor with a current of 200 amperes? For each of the next 3 Problems (#6 – 9), calculate the amount of energy used in both kilowatt- hours (kWh) and Joules (J). 6. A 3000-watt water heater operating for 30 minutes. 7. A 1000-watt iron left on for 3 hours. 8. A 30-watt flashlight left on for 15 minutes. 9. What is the advantage of using kWh over J as a unit of measurement? Mrs. N Gill Science 9
Name: _______________________________________________________________Date: _________________________Block:___ 10. A microwave oven operates on 5 amps of current on a 110-volt circuit for one hour. Calculate the total kilowatt-hours used. 11. How much would it cost to run the microwave in Problem 10 if the cost of energy is $0.10 per kWh? 12. A refrigerator operates on 15 amps of current on a 220-volt circuit for 18 hours per day. How many kilowatt-hours are used per day? 13. If the electricity costs are $0.15 per kWh, how much does it cost to run the refrigerator in Problem 12 per day? 14. The meter reading on June 1 was 84502 kWh. On July 1, the meter read 87498 kWh. If the cost of electricity in the area was $0.12 per kWh, what was the electric bill for the month of June? 15. A room was lighted with three 100-watt bulbs for 5 hours per day. If the cost of electricity was $0.09 per kWh, how much would be saved per day by switching to 60-watt bulbs? Mrs. N Gill Science 9 Answers : 0.55 kWh 59.4 kWh 83.3 V 3 W 5.4¢ $8.91 5400000J 5.5¢ $359.52 4.2 A 1.5 kWh 3 kWh 75 W 10800000 J 0.0075 kWh 2.5 V 27000 J
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