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1. A heater marked 2 000 W/3 000 W is switched on for 4 hours. For the first hour, it is on the highest setting, and for the last 3 hours, it is on the lowest setting. a)- How much energy does it transfer to the room in kWh? (9 kWh)

1. A heater marked 2 000 W/3 000 W is switched on for 4 hours. For the first hour, it is on the highest setting, and for the last 3 hours, it is on the lowest setting. a)- How much energy does it transfer to the room in kWh? (9 kWh)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Solution: Complete the table to work out the total power. Summative Appliance Time Electricit Power Total power rating (W) Oven Television (UM) 4 hours 00 0 0 Kettle 10 minutes 000 0 1 800 Refrigerator 6 hours 009 Hot water geyser 45 minutes 000 2 250 Microwave a) a region i b) force exp c) the prod 15 minutes Give one wor Computer 6 x 100 W light 2 hours 175 250 6 hours bulbs 009 d) the indu to the c Total 12 425 12 425 Wh = 12,425 kWh x RO.60 = R75.55 e) the law f) the rat Test yourself 6: 1. A heater marked 2 000 W/3 000 W is switched on for 4 hours. For the first 2. Correct ea a) The di electr hour, it is on the highest setting, and for the last 3 hours, it is on the lowest setting. b) Wher need a)- How much energy does it transfer to the room in kWh? (9 kWh) b) What is the cost of heating the room if electricity costs 70c per kWh? (R6,30) 2. The reading on an electricity meter shows that 30 kWh of energy have been supplied to a house during one day. a) What is the average power consumption (per hour) of the house in c) The c com d) A di e) A 6 this time? (1,25 kW per hour) f) A 1 of b) Electricity is charged at 70c per kWh. How much is the electricity bill be for that day? (R21,00) 3. Choos a) At Did you know? A. Global electricity price comparison b) 16 Country US cents/kWh Italy Country US cents/kWh 19,70 France Germany 9,61 18,56 United States Spain 9,48 15,37 South Africa United Kingdom 15,10 8,55 Canada
Transcribed Image Text:Solution: Complete the table to work out the total power. Summative Appliance Time Electricit Power Total power rating (W) Oven Television (UM) 4 hours 00 0 0 Kettle 10 minutes 000 0 1 800 Refrigerator 6 hours 009 Hot water geyser 45 minutes 000 2 250 Microwave a) a region i b) force exp c) the prod 15 minutes Give one wor Computer 6 x 100 W light 2 hours 175 250 6 hours bulbs 009 d) the indu to the c Total 12 425 12 425 Wh = 12,425 kWh x RO.60 = R75.55 e) the law f) the rat Test yourself 6: 1. A heater marked 2 000 W/3 000 W is switched on for 4 hours. For the first 2. Correct ea a) The di electr hour, it is on the highest setting, and for the last 3 hours, it is on the lowest setting. b) Wher need a)- How much energy does it transfer to the room in kWh? (9 kWh) b) What is the cost of heating the room if electricity costs 70c per kWh? (R6,30) 2. The reading on an electricity meter shows that 30 kWh of energy have been supplied to a house during one day. a) What is the average power consumption (per hour) of the house in c) The c com d) A di e) A 6 this time? (1,25 kW per hour) f) A 1 of b) Electricity is charged at 70c per kWh. How much is the electricity bill be for that day? (R21,00) 3. Choos a) At Did you know? A. Global electricity price comparison b) 16 Country US cents/kWh Italy Country US cents/kWh 19,70 France Germany 9,61 18,56 United States Spain 9,48 15,37 South Africa United Kingdom 15,10 8,55 Canada
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