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Electricity F3

Total questions: 45

Worksheet time: 33mins

Name
Class
Date
1.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
2.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
3.

In a _______ a spinning turbine moves magnets which generates an electric current.

a)

Motor

b)

Generator

4.
What can you use to make an electromagnet?
a)
Battery, nail and string 
b)
Battery, pencil and wire
c)
Wire, battery and iron ore (nail)
d)
Peanut butter, lampshade, hand sanitizer
5.
What energy do you put IN to a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
6.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator 
c)
Resistance 
d)
Conductor 
7.

An electric motor changes electrical energy to _________ energy.

a)

mechanical

b)

chemical

c)

potential

d)

electrical

8.
What is the device seen here?
a)
generator
b)
electric motor
c)
electromagnet
d)
magnet
9.

If you were to make a motor stronger, what should you do?

a)

Decrease the voltage

b)

Increase the voltage

c)

Disconnect the wires from the batteries

d)

Use a wooden rod instead of a wire

10.
What is the energy involved in spinning?
a)
kinetic
b)
electrical
c)
chemical potential
d)
thermal
11.
Which of the following electrical generators does NOT involving spinning?
a)
Coal
b)
Nuclear
c)
Tidal
d)
Solar panels
12.
What is the best energy chain for coal fired power plants
a)
chemical -> kinetic -> electrical
b)
kinetic -> electrical
c)
electrical -> chemical -> heat
d)
kinetic -> chemical -> electrical
13.
Which is the best energy chain for nuclear power plants?
a)
Thermal -> kinetic -> electrical
b)
light -> kinetic -> thermal
c)
thermal -> electrical
d)
light -> kinetic -> electrical
14.
Which electrical generator has this energy chain?
kinetic -> electrical
a)
wind
b)
natural gas
c)
nuclear
d)
solar panel
15.
which electrical generator has this energy chain?
thermal -> kinetic -> electrical
a)
diesel
b)
geothermal
c)
tidal
d)
solar panel
16.
What does coal, natural gas and diesel have in common that nuclear is lacking?
a)
They all involve burning.
b)
They all start with a hot material.
c)
There is spinning involved.
d)
They are all renewable resources.
17.
What energy type powers a wind turbine?
a)
kinetic
b)
elastic
c)
electrical
d)
solar
18.

Electrical energy is transferred through ______________ in a transformer.

a)

electric field

b)

rotor

c)

magnetic field

d)

air space

19.

Primary winding of a transformer is determined by _________.

a)

which winding has more turns

b)

which winding is nearer to the load

c)

which winding is connected to the source

d)

which side has the highest voltage

20.

What type of transformer is used to increase the voltage from power stations.

a)

Step-down transformer

b)

Step-up transformer

21.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

22.

Which of the following does not change in a transformer?

a)

Voltage

b)

Current

c)

Power

d)

Frequency

23.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

24.

Ratio of voltages is equal to ratio of _______________________.

a)

number of iron sheets in core

b)

number of coil

c)

number of turns in coil

d)

number of electromagnetic

25.

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

a)

480V

b)

30V

c)

20V

d)

450V

26.

The input voltage to a transformer is usually ____ voltage.

a)

AC

b)

DC

c)

both AC & DC

27.

Select any and all that apply.

In a plug, the live wire is normally colored...

a)

Black

b)

Red

c)

Brown

d)

Green

e)

Yellow

28.

Select any and all that apply.

In a plug, the neutral wire is normally colored...

a)

Blue

b)

Red

c)

Brown

d)

Green

e)

Yellow

29.
Your body is a conductor of electricity.
a)
true
b)
false
30.
What is the resistance in this circuit? 
a)
0.05Ω
b)
1.8Ω
c)
20Ω
31.
The fuse in a circuit melts when:
a)
An appliance isn't earthed
b)
Too much current flows
c)
Too much voltage flows
32.
A double insulated appliance does not need:
a)
A fuse
b)
A earth wire
c)
A neutral wire
33.
What's the first thing you should do if someone is shocked electrically?
a)
Use the fire extinguisher
b)
Check for breathing and heartbeat
c)
Turn off the power source
d)
Remove the person from the power source
34.
a switch that automatically opens if the current in the circuit is too high
a)
parallel circuit
b)
circuit breaker
c)
series circuit
d)
load
35.
the type of current that is used in mains electricity
a)
appealing current
b)
diverting current
c)
alternating current
d)
direct current
36.
measure of power
a)
watt
b)
ohm
c)
volt
d)
amp
37.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
38.
What is the current through a 11V bulb with a power of 99W?
a)
9W
b)
9A
c)
60V
d)
60A
39.
A _________ is a plug or cartridge containing a strip of metal that melts when more than a specified amount of current passes through it.
a)
fuse
b)
breaker
c)
circuit
d)
panel
40.

Which one is a Fuse?

a)
b)
c)
d)
e)
41.
The power of an appliance is...
a)
the amount of voltage going through it 
b)
the amount of energy transferred per second
c)
the amount of charge that passes through per second
42.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
43.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
44.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI
a)
80 W
b)
200 W
c)
2.5 A
d)
22.5 KJ
45.
If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?
a)
3A
b)
5A
c)
13A

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