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Electricity Exam (PF22)

Total questions: 64

Worksheet time: 47mins

Name
Class
Date
1.

Electricity happens with the flow of

a)

electrons.

b)

water

c)

sand

2.
If two charges repel each other, the two charges must be
a)
Positive and neutra
b)
Positive and negative
c)
positive and neutral
d)
negative and negative
3.
An object becomes charged when the atoms in the object gain or lose
a)
electrons
b)
protons
c)
neutrons
d)
all of the above
4.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.
5.
Objects that have opposite charges
a)
are attracted to each other, and the force between the objects pulls them together.
b)
are attracted to each other, and the force between the objects pushes them apart.
c)
are repelled by each other, and the force between the objects pulls them together.
d)
are repelled by each other, and the force between the objects pushes them apart.  
6.

Ms Pippin rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

a)

The balloons will repel each other.

b)

The balloons will attract each other.

c)

The balloons will become positively (+) charged.

d)

The balloons will pop.

7.

what is an electric cell?

a)

a device that converts mechanical energy into electrical energy

b)

a device that turns stored chemical energy into electrical energy

c)

a device that devours electrical energy

d)

a device that converts static electricity into mechanical energy

8.

What is the unit we use to measure electric current?

a)

ampere (amp)

b)

ohm

c)

volt

d)

newton

9.

What is resistance

a)

the rate at which a charge is flowing

b)

the material's tendency to resist flow of electrons

c)

the difference of charge between 2 points

d)

it is futile

10.

What is an electric current?

a)

a build up of electrons

b)

the difference in charge between 2 points

c)

the flow of electrons over a circuit

d)

the opposition to flow of electrons

11.

How does electric current flow?

a)

from lower charge to higher charge

b)

from higher charge to lower charge

12.

What is voltage?

a)

the rate of flow of charge

b)

the difference in charge between 2 points

c)

the amount of available charge

13.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator 
c)
Resistance 
d)
Conductor 
14.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
15.
What is the power of a 3V light bulb with 20 A running through it?
a)
0.15W
b)
6W
c)
60W
d)
6.67W
16.
In a series circuit  with 4 bulbs:
a)
a switch is never used
b)
all of the bulbs become dimmer if another bulb is added
c)
There are many paths for electricity to take
d)
the remaining 3 bulbs stay lit if one burns out
17.
What happens to the brightness of the light bulbs in a series circuit when you add more lights.
a)
Each bulb gets dimmer
b)
Each bulb remains the same
c)
Half of the bulbs get dimmer
d)
Each bulb gets brighter
18.
A __________opens and closes a circuit?
a)
key
key
b)
magnet
c)
switch
d)
electromagnet
19.
What is the purpose of a switch?
a)
To open and close the circuit.
b)
To carry the electricity through the circuit.
c)
To make a fun clicking sound
d)
To supply the power to the circuit
20.
What are the components of a simple circuit?
a)
wires, switch, outlet
b)
battery, switch, motor
c)
wires, light bulb, motor
d)
wires, battery, light bulb
21.
Is this circuit open or closed?
a)
Closed
b)
Open
22.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
23.
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
24.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
25.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
26.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
27.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
28.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
29.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
30.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
31.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

32.

Voltage divided by Current

(V / I)

a)

Current

b)

Power

c)

Resistance

d)

Watts

33.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
34.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
35.

If one bulb was broken, what would happen?

a)

current would no longer flow, so everything would be off

b)

the ammeter would measure a current from the other bulb

c)

the switch would keep the current flowing

d)

the cell would burn out and catch fire

36.

If the current flowing through the cell is 2A, what is the ammeter reading?

a)

5A

b)

1A

c)

6A

d)

2A

37.

What causes a decrease in current? Select all that apply.

a)

Adding another bulb

b)

increasing resistance

c)

decreasing voltage from the supply

d)

decreasing the resistance

38.
Pick the correct sentence.
a)
This circuit will work because it is a closed circuit.
b)
Energy will freely flow in this circuit.
c)
This circuit will not work because there is no energy source.
d)
This circuit will not work because there is no switch.
39.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
40.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
41.
How many different types of circuits are there? 
a)
1
b)
3
c)
2
d)
4
42.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
43.

"When more light bulbs are added, they all remain bright. " Does this statement describe a series circuit or parallel circuit?

a)
Parallel circuit
b)
Series circuit
44.

Which characterictics would describe an incandenscent light bulb? (select all that apply)

a)

very energy efficient

b)

made with mercury

c)

contains a filament

d)

most of the energy is transferred to heat

e)

bulbs used in our lab

45.

Which are the characterictics of a CFL light bulb? (select all that apply)

a)

These should be thrown in the regular trash.

b)

These light bulbs use 85% less energy than an incandescent bulb.

c)

Contain Mercury gas

d)

Contain a filament made of tungsten.

e)

Last 20X longer than an incandescent bulb.

46.

Which are the characterictics of a LED light bulb? (select all that apply)

a)

Are the most energy efficient of all bulbs.

b)

These light bulbs use 85% less energy than an incandescent bulb.

c)

Contain Mercury gas

d)

Contains many diodes in a single bulb.

e)

Have the longest life of all bulbs

47.

Problems with the CFL (compact fluorescent lights) include (select all that apply)

a)

made with a toxic substance - mercury

b)

tmade with a toxic substance - tungsten

c)

produce a unpleasant light - wavelength that is different from the incandescent bulb.

d)

are the most expensive bulb

48.

Which bulb generates the most heat?

a)
b)
c)
49.

Which bulb is made with a semi-conductor that moves electrons to produce light?

a)
b)
c)
50.

Which bulb is the most energy efficient and most expensive?

a)
b)
c)
51.

Which is the correct energy efficiency for the light bulbs (from least to greatest)?

a)

CFL - LED - incandescent

b)

incandescent - LED - CFL

c)

incandescent - CFL - LED

d)

LED - CFL - incandescent

52.

Which bulb is the most inexpensive?

a)
b)
c)
53.

The Fairmont School District replaced all of the lights about 3 years ago in all of the buildings. They switched from __________ to _____________ to save energy and money.

a)

incandescent to CFL

b)

CFL to LED

c)

incandescent to LED

d)

LED to CFL

54.

How does the thickness of a wire affect resistance?

a)

A thicker wire has more resistance

b)

A thinner wire has more resistance

c)

Thickness of a wire does not affect resistance

55.

If the length of a wire increases, the resistance ____________

a)

a. decreases

b)

b. increases

c)

c. stays the same

d)

d. unknown

56.

As resistance increases, the current in a circuit will

a)

increase

b)

decrease

c)

stay the same

d)

burn up

57.

Metals are good ____________ of electricity and heat.

a)

Conductors

b)

Insulators

58.

We measured our batteries in _________.

a)

Amps

b)

Volts

c)

Degrees

59.

Electricity is the movement of...

a)

Electrons

b)

Protons

c)

Neutrons

60.

Objects that are in contact with the Earth are

a)

lightning rod

b)

electric discharge

c)

electric current

d)

grounded

61.
If the hair dryer and the vacuum cleaner are both on, what is the power used?
a)
2600 watts
b)
400 watts
c)
2200 watts
d)
1100 watts
62.
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
63.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
64.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second

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