Theory Worksheet 13.2
Authored by Liren Fu
Science
8th Grade
Used 10+ times
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24 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A light bulb has a power rating of 40 W. When the light bulb is switched on, it converts __________ of electrical energy into light and heat in one second.
40 W
40 kWh
40 J
40 V
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the BEST answer to the following question:
"Fuses and circuit breakers are useful because they cut off the current..."
before enough heat can build up to cause a fire
to conserve energy
so that we do not have to switch off the current by hand
to help reduce our electricity bill
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During a one-week holiday abroad, May accidentally left a 1,200 W air-conditioner on at home. The energy wasted is...
201,600 kWh
8,400 kWh
28,800 kWh
202 kWh
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cost of using Air-conditioner A in a month?
$129.60
$145.80
$162
$486
5.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Choose ALL the components that make up the answer to:
"After replacing Air-conditioner A with Air-conditioner B, Marie saves $1.80 on her electricity bill each month. She formulates a hypothesis that this is because the power rating of her new air-conditioner is lower.
Marie’s hypothesis may not be correct. Explain how she can test her hypothesis."
She should use Air-conditioner B for the same number of hours as she used for Air-conditioner A every night.
She should use Air-conditioner B for a different number of hours than what she used for Air-conditioner A every night.
She should use Air-conditioner B for a varying number of hours as what she used for Air-conditioner A every night.
She should also keep her daily usage of other electrical appliances the same.
She should also vary her daily usage of other electrical appliances the same.
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
What safety rules are being broken in this image? Choose all that apply.
He is cleaning or repair an electrical appliance with the plug connected to the socket.
He is trying to fix the appliance without calling the electrician to repair the damaged appliance/electrical cables.
He is sticking something into an electrical appliance with the plug connected to the socket.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The earth wire diverts current in order to prevent _________, which would be caused by a large current flowing in the _________.
electrocution, body
electrocution, wires
electrical fire, body
electrical fire, wires
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