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Science 9: Unit D Electricity

Total questions: 120

Worksheet time: 2hrs 31mins

Name
Class
Date
1.
The flow of electricity in a circuit-
a)
current
b)
flow
c)
circuit
2.
Magnetism created by an electric current
a)
electricity
b)
electromagnetism
c)
wind energy
3.

____________ allows electrons to move easily through material

a)

A conductor

b)

An insulator

c)

A magnet

4.
____________ stops the flow of electricity.
a)
A conductor
b)
An insulator
c)
A magnet
5.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
6.
The plastic around the wire is
a)
conductor
b)
insulator
c)
decoration
7.
Two batteries in a circuit make the lights in the circuit brighter than one battery.
a)
true
b)
false
8.
If the lights are off, the circuit is
a)
closed
b)
open
9.
In a parallel circuit the current
a)
makes one circle
b)
stays in one path
c)
splits and goes through two components
10.
Is the circuit pictured complete or incomplete? 
a)
Complete
b)
Incomplete
11.
What is the power source for this circuit?
a)
Battery
b)
Electric socket
c)
Wires
d)
Magic
12.
What kind of circuit is this?
a)
series
b)
parallel
13.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
14.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator 
c)
Resistance 
d)
Conductor 
15.
A material in which electrons are not able to move easily 
a)
Circuit 
b)
Insulator 
c)
Resistance 
d)
Conductor
16.
the type of current that is used in  outlets
a)
apparating current
b)
diverting current
c)
AC
d)
DC
17.
measure of power
a)
watt
b)
ohm
c)
volt
d)
amp
18.
provides more than one path for the electrons to follow
a)
series circuit
b)
parallel circuit
c)
insulator
d)
conductor
19.
What is one problem with using a series circuit? 
a)
It has a lot of series. 
b)
If one light goes down, they all go down! 
c)
It doesn't work properly.
d)
There are no problems. 
20.
What is a benefit of using a parallel circuit?  
a)
It gets confusing.
b)
There are no problems.
c)
If one light goes out, it does not affect the others. 
d)
If one light goes out, they all go out. 
21.

What are the three components of a circuit?

a)

Pathway, Source, and Battery.

b)

Energy source, Conductor, and a load.

c)

Battery, Bulb, and Plastic.

d)

Wire, Electron, and Charge.

22.

In the following diagram, the lightbulb is:

a)

Pathway

b)

Energy source

c)

The conductor

d)

The Load

23.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
24.

How many cells are in this battery?

a)

1

b)

2

c)

3

d)

4

25.
Would would best complete this circuit?
a)
A wire
b)
A switch
c)
A battery
d)
A light bulb
26.

Two positive charges would attract or repel?

a)

Repel

b)

Attract

27.

which device breaks the flow of a current when an overload occurs is

a)

grounding wire

b)

conductor

c)

circuit breaker

d)

nameplate

28.

if an electrical appliance is dropped into water the foreign conductor causes

a)

overload

b)

open circuit

c)

closed circuit

d)

short circuit

29.
The tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy and light.
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit 
30.

Potential difference is measured in __.

a)

volts.

b)

watts.

c)

coulombs.

31.

The buildup of electric charges on an object is called

a)

static electricity

b)

conductor

c)

current electricity

d)

charge separation

32.
Electricity is the flow of _________.
a)
Protons
b)
Neutrons
c)
Electrons
33.
a build up of charged particals
a)
electricity
b)
electric current
c)
static electricity
d)
circuit
34.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
35.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
36.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
37.
A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance
a)
58 Amps
b)
0.33 Amps
c)
13 Amps
d)
1 Amp
38.

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

a)

1 Ohm

b)

3 Ohms

c)

4 Ohms

d)

12 Ohms

39.

If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor

a)

2.1 Amps

b)

2.4 Amps

c)

1.71 Amps

d)

15 Amps

40.

How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor

a)

12 volts

b)

24 volts

c)

1.3333

d)

48 volts

41.
What is the major difference between static electricity and current electricity?
a)
Current electricity involves a continuous flow of neutrons; static electricity is a sudden transfer of protons
b)
Current electricity can be deadly; static electricity is almost always safe
c)
In current electricity, there's a single transfer of electrons; in static electricity, there's a steady flow of electrons
d)
Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons
42.
What happens when you touch a metal doorknob after rubbing your shoes on the carpet?
a)
The doorknob sends a burst of electric current into your body
b)
Millions of electrons go from your finger into the doorknob
c)
The doorknob sends millions of electrons into your finger
d)
our finger becomes negatively charged
43.
What is the continuous movement of electrons called? 
a)
static electricity
b)
current electricity
c)
friction
d)
power
44.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
45.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
46.
a)
all bulbs are lit equally
b)
the two top bulbs are brighter
c)
the single lower bulb is brighter
d)
the single bulb does not light and the other two are dim
47.
During a lab a balloon was rubbed with a wooly fabric. This is an example of which type of charging?
a)
conduction
b)
friction
c)
induction
48.
the charging of an object through rubbing.
a)
friction
b)
induction
c)
conduction
d)
neutralization
49.
Which energy conversion shown below takes place in an electrochemical cell?
a)
Electrical to chemical
b)
Mechanical to chemical
c)
Mechanical to electrical
d)
Chemical to electrical
50.

2 different metals that lose or gain electrons in a battery (zinc and copper) in an electrochemical cell

a)

wet cells

b)

dry cells

c)

electrolytes

d)

electrodes

51.
liquid in a battery that allows electrons to move from one metal to the other (fruit juice, vinegar)
a)
Wet Cells
b)
Dry Cells
c)
Electrolyte
d)
Electrodes
52.
a type of cell that contains solid or pastelike electrolytes
a)
Wet Cells
b)
Dry Cells
c)
Electrolytes
d)
Electrodes
53.
a cell that has a liquid electrolyte
a)
wet cells
b)
dry cells
c)
electrolytes
d)
electrodes
54.
converts thermal energy into electrical energy
a)
Potential Difference
b)
Galvanometer
c)
Thermocouples
d)
Photo Cell
55.
Which way do electron flow?
a)
Positive to negative
b)
Negative to positive
c)
Negative to Negative
d)
Positive to Positive
56.

What causes climate change?

a)

burning fossil fuels

b)

too many birds

c)

hurricanes

d)

bad batteries

57.

The challenge is to make the switch to other forms of energy, like solar and wind. These are ___ .

a)

renewables

b)

nonrenewables

c)

batteries

d)

burning coal

58.

Burning fossil fuels, like gasoline, emits what gas?

a)

carbon dioxide

b)

oxygen

59.
An object that is neutral contains the same number of electrons and protons.
a)
True
b)
False
60.
Which electrical component does the diagram represent?
a)
Bulb
b)
Wire
c)
Ammeter
d)
Battery
61.
Which electrical component does the diagram represent?
a)
Wire
b)
Open switch
c)
Closed Switch
d)
Battery
62.
Select the electrical component used to measure voltage.
a)
Voltmeter
b)
Vaultmeter
c)
Ammeter
d)
 Ampmeter
63.
Select the electrical component used to measure current.
a)
Voltmeter
b)
Vaultmeter
c)
Ammeter
d)
 Ampmeter
64.
the most common functions of a generic multi-meter are_______________
a)
voltmeter,ammeter, and ohmmeter
b)
voltmeter,ohmmeter, and wattmeter
c)
voltmeter, wattmeter, and light level
d)
wattmeter, light level, and ammeter
65.
The fuse in a circuit melts when:
a)
An appliance isn't earthed
b)
Too much current flows
c)
Too much voltage flows
66.
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
67.
It is important when you see a down power line to _______________________________________.
a)
stay far away from it
b)
walk up and see what is happening
c)
pick it up and move it
d)
throw something at it
68.
What should you do if a power line is touching your car?
a)
jump out and pull the power line off the car, then run for help
b)
jump out with both feet landing at the same time and shuffle away from the car
c)
tell people to come help you
d)
get out and run away
69.
How come birds on electric wires don't get electrocuted?
a)
because they are birds
b)
because they are not wet
c)
because they aren't touching the ground
d)
because they have feathers
70.
Circuit breakers are more commonly used than fuses.  
a)
True
b)
False
71.
Overloading a circuit with too many appliances could cause overheating and fire.  
a)
True
b)
False
72.

A device used to stop and start the flow of electric current in a circuit

a)

a battery

b)

a conductor

c)

a switch

d)

an insulator

73.

what is the cause of static electricity?

a)

friction

b)

static

c)

battery

d)

shock

74.

What will happen when a charged balloon goes close to a wall?

a)

nothing it will fall to the ground

b)

it will stick to the wall because of charge separation

c)

it will stick to the wall as the wall is positively charged

d)

it will stick to the wall as it is negatively charged

75.

During a thunder and lightning storm where should you be if you were on a golf course

a)

laying flat on the ground

b)

holding an umbrella

c)

taking cover under a tree

d)

staying under your golf cart

76.

A bunch of cells put together create

a)

a dry cell

b)

a rechargeable cell

c)

a battery

d)

a primary cell

77.

How does a Van de Graaff generator produce static electricity?

a)

It uses friction to produce the static electricity

b)

It uses magnets to attract electric charges

c)

It uses current electricity to remove static charges

d)

It uses electricity to add electric charges

78.

you walk by the downed power line and touch a metal pole what will happen?

a)

nothing

b)

you create a short circuit, getting burned

c)

you feel a quick shock by becoming part of the circuit

79.

Resistance in electricity can be compared to what in water?

a)

height of the waterfall

b)

amount of water in the flow

c)

size of the splash at the bottom

d)

rocks in the path of water

80.

Which battery can be recharged?

a)

primary cell

b)

secondary cell

81.

What makes a secondary cell rechargeable?

a)

electrolyte can be replaced

b)

electrodes can be reversed

c)

chemical reactions can be reversed

82.

The use of electricity to coat a thin later of metal onto an object is called

a)

electricity

b)

electrolysis

c)

electroplating

d)

anodizing

83.

What does an electrochemical cell include?

a)

only an electrolyte

b)

only an electrode

c)

two electrodes made of different materials, and an electrolyte made up of a liquid or paste

d)

two chemicals

84.

The decomposition of a substance by an electrical current is called

a)

electricity

b)

electrolysis

c)

electroplating

d)

anodizing

85.

an example of an electric discharge is

a)

a shock

b)

rubbing a balloon on your head

c)

rubbing your feet on a carpet

86.

T/F insulators can become conductors when enough electricity is applied?

a)

True

b)

False

87.

What demonstrates current electricity?

a)

rocks in water

b)

height of a waterfall

c)

water flowing down a river

88.

Which situation would be the most serious shock?

a)

touching an electric fence while standing on a block of wood

b)

touching an electric fence while standing in water

c)

touching an electric fence while standing on grass

d)

touching an electric fence while wearing rubber boots

89.

What is the difference between fuses and breakers

a)

fuses need to be replaced while breakers can be turned back on

b)

breakers need to be replaced while fuses can be turned back on

90.

What is a fuse

a)

A fuse has a metal strip that can be replaces after melting when too much electricity passes through the fuse

b)

A fuse has a spring mechanism that turns off a switch when too much electricity passes through the fuse

c)

A fuse has a thin metal strip inside, which melts when too much electricity passes through the fuse

d)

A fuse will only allow a certain amount of electricity through it and must be replaced before it burns out

91.

What kind of energy conversion takes place in a toaster

a)

electrical to thermal

b)

chemical, to thermal, to mechanical

c)

chemical, to thermal

d)

electrical, to thermal, to mechanical

92.

What kind of energy conversion takes place in a water wheel

a)

mechanical to electrical

b)

thermal to chemical

c)

mechanical to electrical to chemical

d)

Chemical to mechanical

93.

What energy conversion happens in a battery operated flashlight

a)

electrical to thermal to light

b)

electrical to thermal

c)

chemical to thermal

d)

chemical to electrical to light

94.

Which of the following will result in an electric current

a)

2 copper wires placed into a lemon with a voltmeter connected to the wires

b)

a paper clip and copper wire placed into a lemon with a voltmeter connected between the wire and paper clip

c)

2 paper clips places into a lemon with a voltmeter connected between two paper clips

95.

Which of the following is an insulator

a)

tap water

b)

pure water

c)

metal

96.

How do neon signs created different colours

a)

different electrical current

b)

different colours of glass tubes

c)

different colours of gas and special coatings

d)

different types of wires inside the glass tubes

97.

How would you design a light bulb to produce a bright light using a small amount of current

a)

a filament with high reistance

b)

a filament with low resistance

c)

a filament with no resistance

98.

The device that turns on a light automatically is called

a)

rheostat

b)

variable resistor

c)

transistor

d)

photoconductor

99.

If a machine is 75% efficient it means

a)

it converts 75% of input energy into a usable form

b)

it converts 75% of output energy into a usable form

c)

it converts 25% of input energy into a usable form

d)

it converts 25% of output energy into a usable form

100.

The energuide label purpose is to indicate

a)

the amount of energy required in manufacturing the applince

b)

the current required to operate the appliance

c)

the average yearly energy consumption of the appliance

d)

to compare the appliance to others

101.

Why are electric motors more efficient than gas powered motors?

a)

Electric motors do not produce any thermal energy and as a result more energy is considered useful.

b)

Electric motors require less joules of power to operate doing the same amount of work

c)

Electric motors do not rely on converting input energy into mechanical energy, which is inefficient.

d)

Electric motors have fewer moving parts, so less energy is lost as heat created by friction.

102.

The object you bronze acts as an

a)

electrode

b)

battery

c)

acid

d)

electrolyte

103.

The process that bronzes objects is called

a)

electroplating

b)

electrolysis

c)

super conduction

104.

a toasters electricity was switching direction 30 times per second. The toaster uses

a)

DC 30 hertz

b)

DC 30 ohms

c)

AC 30 hertz

d)

AC 30 ohms

105.

How are motors and generators similar?

a)

they both produce AC current

b)

they both have a rotating coil of wire between two magnets

106.

On a wind turbine, the blades are attached to the

a)

frame

b)

generator

c)

rotor

107.

What would be an example of a societal decision to save energy?

a)

Tim replaces his car with an electric car

b)

Sue walks to work

c)

The city decides to install low watt street lamps

108.

Find the resistance if the voltage is 12 v and current is 3 A

a)

36 Ohms

b)

4 Ohms

c)

0.25 R

d)

4 R

109.

Find the current if the resistance is 5 Ohms and the voltage is 60 v

a)

12 I

b)

0.08 I

c)

300 A

d)

12 A

110.

Find the voltage if the current was 70 A and the resistance is 2 ohms

a)

140 V

b)

35 V

c)

0.028 V

d)

280 V

111.

Find the power if the voltage is 220 V and the current is 150 A

a)

3300 W

b)

1.466 W

c)

33 000 W

d)

33 000 J

112.

Find the voltage if you had a power of 130 W and a current of 10 A

a)

1300 V

b)

13 V

c)

0.077 V

d)

130 V

113.

Find the power in joules if you had a power of 345 W if the object was on for 5 minutes

a)

1725 J

b)

69 J

c)

103500 J

d)

10350 J

114.

Find the energy in joules if it used 123 Watts for 1 hour

a)

442800 J

b)

7380 J

c)

123 J

d)

2.05 J

115.

Find the energy in kW h if the power is 540 W and it takes 45 minutes

a)

24300 kW h

b)

1458000 kW h

c)

0.405 kW h

d)

405 kW h

116.

What is the energy in kW h if the time is 25 minutes and the power was 87 W

a)

2175 kW h

b)

36.25 kW h

c)

0.03625 kW h

117.

Find the efficiency if the input energy is 240 kJ and has an output energy of 111 kJ

a)

0.4625%

b)

46.25%

c)

2.16%

d)

216.22%

118.

Find the efficiency if the output energy is 1230 J and output energy is 1700 J

a)

72.35 %

b)

0.7235 %

c)

1.38 %

119.

What is the most efficient machine

A: input 600J output 488 J

B:input 1330 J output 1156 J

C: input 56J output 42 J

a)

A

b)

B

c)

C

120.

What is the most efficient machine

A: input 2500J output 1700 J

B:input 120J output 76 J

C: input 560J output 321 J

a)

A

b)

B

c)

C

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