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Unit 3 Electricity and Magnetism

Total questions: 39

Worksheet time: 39mins

Name
Class
Date
1.
Which change to an electromagnetic would strength the magnetic field?
a)
add a battery
b)
reduce the number of coils
c)
switch the direction of the battery
d)
remove the iron nail
2.
What device is used to create electricity?
a)
resistor
b)
insulator
c)
voltmeter
d)
generator
3.
If all batteries are the same which circuit will have the brightest light bulbs?
a)
A
b)
B
c)
C
d)
D
4.
Which bulb will light?
a)
A
b)
B
c)
C
d)
D
5.
What type of circuit is this?
a)
Series
b)
Open
c)
Parallel
d)
Alternating
6.
Which of the following will make an electromagnet stronger?
a)
Making the loops of wire less tightly coiled.
b)
Using a longer wire from the battery to the nail.
c)
Wrapping the wire around the nail more times.
d)
Wrapping the wire around a nonmetallic object.
7.

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)

75.6 Amps

c)

0.48 Amps

d)

6.6 Amps

8.

Which copper wire has the smallest resistance?

a)

a short, thick wire

b)

a long, thin wire

c)

a long, thick wire

d)

a short, thin wire

9.

If the resistance of a circuit increases, then the current through the circuit would ____.

a)

decrease

b)

increase

c)

be unchanged

d)

Not enough information

10.

In a parallel circuit, if one of the light bulbs burns out the rest _________.

a)

stop the flow of electricity

b)

can still light up

c)

will go out too

d)

Not enough information

11.
What is this?
a)
magnet
b)
electromagnet
c)
series circuit
d)
parallel circuit
12.

In a parallel circuit, ________________ is consistent throughout.

a)

current

b)

power

c)

resistance

d)

voltage

13.

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 has more than one path to flow through

14.

How many lightbulbs will work if there is a break in the circuit at POINT A?

a)

1

b)

2

c)

3

d)

NONE

15.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
16.
A series circuit has ____ path(s) that the electric current can take. 
a)
One
b)
Two 
c)
Three 
d)
Four
17.

1. Which switch or switches must be closed to make the lamps light?

a)

Only switch 1

b)

Only switch 1

c)

Switches 1 and 2

d)

Switches 1 , 2 and 3

18.

Tammy makes a complete simple circuit with one bulb and three batteries. The bulb lights for an instant and then goes out. Why?

a)

Too much electricity flows through the bulb's filament

b)

Not enough electricity flows around the circuit

c)

The batteries are flat

d)

The batteries are not good

19.

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

a)

It will stay lit

b)

It will go out

c)

It will get dimmer

d)

It will dissapear

20.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
21.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
22.
Which best describes a parallel circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from one source. 
c)
Electricity flows along more than one pathway. 
d)
The flow of electricity comes from more than one source. 
23.
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.
24.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
25.

An electric motor changes electrical energy to _________ energy.

a)

mechanical

b)

chemical

c)

potential

d)

electrical

26.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
27.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
28.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
29.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
30.

If all of the batteries have the same voltage, which circuit will have the dimmest (least bright) bulbs?

a)

LEFT

b)

MIDDLE

c)

RIGHT

d)

if they have the same voltage they will all be the same brightness.

31.

If the direction of the current flowing in a wire is reversed, the magnetic field will...

a)

disappear

b)

stay the same

c)

reverse direction

d)

get stronger

32.

The magnetic field around a solenoid is ____________ the magnetic field around a straight wire.

a)

stronger than

b)

weaker than

c)

the same strength as

33.
Which of the following answers the best completes this hypothesis about electromagnets?
a)
If the wire is coiled more times around the nail, THEN the strength of the electromagnet will decrease.
b)
A.  IF the piece of iron is bigger, THEN the strength of the electromagnet will decrease.
c)
A.  IF the wire is coiled fewer times around the nail, THEN the strength of the electromagnet will increase
d)
A.  IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will increase
34.
  Which objects could you combine to build an electromagnet?
a)
A.  Copper wire, source of electric current, steel screw
b)
B.  Battery, generator, steel screw
c)
C. Compass, source of electric current, copper wire
d)
D..  Battery, lightbulb, plastic straw
35.
This picture shows a turbine generator used to produce electricity at a geothermal power plant.
Electricity is produced by using steam to _____________.
a)
heat the turbine generators
b)
spin the turbine generators 
c)
reduce friction in the turbine generators
d)
reduce emissions from the turbine generators
36.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
37.

The strength of an electromagnet can be affected by

a)

changing the current in the wire

b)

adding more coils

c)

increasing the mass of the iron core

d)

All of the above

38.
A _______________ is a current-carrying coil of wire with many loops
a)
electromagnet
b)
solenoid
c)
magnet
d)
compass
39.
How do electromagnets differ from regular magnets? 
a)
A. They  can be turned off and on 
b)
B. Their polarity can be reversed
c)
C. Their strength can be changed
d)
D. All of the above

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