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Worksheetspower, efficency and cost of electricity
Total questions: 15
Worksheet time: 13mins
Name
Class
Date
1.
Power is a measure of how much ______ can be done in a set amount of ______.
a)
Work, Time
b)
Work, Energy
c)
Energy, Force
d)
Force, Work
2.
Work is a measure of the energy needed to apply a force across a _______.
a)
time
b)
distance
c)
gravity
d)
object
3.
Efficiency is a ______ of what you put in versus what you get out of a system.
a)
source
b)
ratio
c)
multiplication
d)
addition
4.
An object has a weight of 200 N and is moved 3 meters. How much work is done?
a)
66.7 J
b)
600 J
c)
203 J
d)
0.015 J
5.
Flash is the most powerful hero because...
a)
He can do the most in the least amount of time.
b)
He can do the most.
c)
He can move the fastest.
d)
He isn't.
6.
Efficiency is....
a)
measured in Joules.
b)
a percentage.
c)
measured in Watts.
d)
measured in Newtons.
7.
For there to be work, there must always be distance.
a)
True
b)
False
8.
Power does not depend on...
a)
strength
b)
work
c)
time
d)
any of these
9.
The unit for Electrical Power is
a)
hour
b)
ampere
c)
watt
d)
Volt
10.
The S.I unit for Electrical Energy is
a)
kwh
b)
KWj
c)
kWh
d)
KWJ
11.
Electrical Energy is affected by
a)
speed
b)
voltage
c)
current
d)
Power
12.
What is the cost of the first 200 block of TNB tariff
a)
RM 436.
b)
RM 0.22
c)
RM 2.18
d)
RM 43.60
13.
This is Lavinder's TV. What is the power rating of this TV?
a)
Toshiba
b)
1000 W
c)
SMART TV 40
d)
RM 899.
14.
Afiqah uses her laptop everyday in her office from morning till lunch hour. Hong long does she use the laptop in a day?
a)
4 hours
b)
6 hours
c)
8 hours
d)
10 hours
15.
What is the efficiency of a car that has enough fuel to drive 600 miles, but only actually drives 150 miles?
a)
25%
b)
4%
c)
400
d)
.25
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