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)
Chapter1: Temperature And Heat
Section: Chapter Questions
Problem 101P: Many decisions are made on the basis of the payback period: the time it will take through savings to...
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Only a)
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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