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WorksheetsElectricity and Magnetism
Total questions: 66
Worksheet time: 33mins
Name
Class
Date
1.
The potential energy of an electric current is measured in units of
a)
amperes
b)
ohms
c)
volts
d)
watts
2.
An electrical wire gets hot when operating because of
a)
current
b)
power
c)
resistance
d)
voltage
3.
The electrical conductivity of a substance depends on the ability of the _______ in it to move.
a)
electrons
b)
neutrons
c)
protons
d)
quarks
4.
What process is the method by which a neutral object obtains an electrical charge?
a)
convection
b)
discharge
c)
induction
d)
radiation
5.
Pretend you are an electron in a copper wire which is being used to connect a battery to a flashlight bulb. Because this circuit uses a(n) ________ current, you as the electron in the wire will
a)
alternating, move first one way then the other
b)
direct, move first one way then the other
c)
alternating, move only in one direction
d)
direct, move only in one direction
6.
Pretend you are an electron flowing through this circuit and you are with a group of other electrons. Suddenly you come to the "fork in the road" and you and some of the other electrons are temporarily separated. A short while later, you are back together with the other electrons. This type of circuit is called a(n) _______ circuit.
a)
closed
b)
open
c)
parallel
d)
series
7.
In order for a light bulb to be on, the circuit must be
a)
closed
b)
open
c)
parallel
d)
series
8.
Which circuit contains the GREATEST voltage?
a)
A circuit with 20 amps and a resistance of 16 ohms
b)
A circuit with 10 amps and a resistance of 10 ohms
c)
A circuit with 25 amps and a resistance of 16 ohms
d)
A circuit with a current of 20 amps and a resistance of 10 ohms
9.
Choose the false statement regarding resistance.
a)
Longer wires have less resistance
b)
Electrical resistance produces heat.
c)
Resistance slows the flow of current
d)
The larger the diameter, the wire, the less resistance.
10.
A battery-operated DVD player uses 12 DC volts from AA batteries and draws a current of 3 A. Calculate the resistance.
a)
4 ohms
b)
9 ohms
c)
15 ohms
d)
36 ohms
11.
What is the voltage of a battery that powers a light with 0.43 A and has a resistance of 3.5 ohms?
a)
1.505 V
b)
3.07 V
c)
3.93 V
d)
8.13 V
12.
There is a single path for electrons. The current decreases when additional resistors are added. This current will be the same in each resistor. These statements BEST describe a(n) ________ circuit.
a)
closed
b)
open
c)
parallel
d)
series
13.
Current that moves in one direction from negative to positive. May be created by a battery. Is generally NOT found in US electrical outlets. Which type of current is described by these statements?
a)
AC
b)
AC/DC
c)
DC
d)
nuclear
14.
After turning on the television, you approach it. As you get close, but not touching it, the hairs on your arm start to stand up. This is an excellent example of static charge built up by
a)
conduction
b)
convection
c)
friction
d)
induction
15.
In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?
a)
as the electrons are sped up, they bunch closer together
b)
As the electrons have more energy, they vibrate more rapidly
c)
as the electrons are pushed more by the battery, they move faster through the circuit
d)
as the distance around the circuit increases, the electrons take longer to travel around
16.
How does current flow in a standard DC circuit?
a)
directly to the resistor and back
b)
changing direction at a regular frequncy
c)
from the negative to the positive terminal
d)
from the positive to the negative terminal
17.
When using a series circuit to connect four small light bulbs, which statement is most accurate?
a)
If one bulb fails, the other three can remain operational.
b)
The current passing through each bulb will be exactly the same.
c)
By adding more light bulbs in the series, it will draw less on the power source.
d)
As more light bulbs are added in series, the brightness of the bulbs will stay the same.
18.
During physical science class, Ben and Jerry connected three identical light bulbs in parallel to a battery. What happens when Ben moves one of the light bulbs from its socket?
a)
All the light bulbs go out.
b)
The other light bulbs remain on and will be equally bright.
c)
The other light bulbs remain on, one brighter and the other less than bright than before.
d)
The other light bulbs remain on, one less bright and the other the same brightness as before.
19.
One disadvantage of a series circuit is
a)
the addition of new light bulbs decreases resistance
b)
as more lights are added to the circuit, the voltage to each decreases
c)
as more lights are added to the circuit, the current to each increases
d)
when the current to one light is turned on, the current to the other lights turns off
20.
One advantage to using a parallel circuit is that
a)
voltage available to each light remains constant regardless of the number of lights hat are on.
b)
current drawn from the battery remains constant regardless of the number of lights that are turned on.
c)
resistance along the circuit remains constant regardless of the number of lights that are on.
d)
current drawn from the battery decreases as more lights are turned on.
21.
A light bulb is a 100-Watt bulb that draws 2 Amps of current in a standard 130-Volt household circuit. Determine the resistance of the light bulb.
a)
0.83 ohms
b)
1.2 ohms
c)
60 ohms
d)
240 ohms
22.
Three light bulbs are connected to a battery in a series circuit. How will the bulbs behave if the circuit is closed?
a)
All three bulbs will glow.
b)
Only the bulb farthest from the battery will glow.
c)
Only the first bulb closest to the battery will glow.
d)
None of the bulbs will glow, but the battery will heat up.
23.
A light bulb, a fan, and a tiny speaker are connected to a battery in a series circuit. How will the circuit behave if it is open?
a)
None of the devices will work.
b)
The battery will heat up and explode.
c)
Only the device closest to the battery will work.
d)
The bulb will light, the fan blow, and the speaker will make noise.
24.
A fan is connected to a battery in a series circuit. What kind of energy transfer occurs if the circuit is closed?
a)
Light energy changes to chemical energy
b)
Thermal energy changes to mechanical energy
c)
Chemical energy changes to mechanical energy
d)
Mechanical energy changes to chemical energy
25.
A strand of ten lights is plugged into an outlet. How can you determine if the lights are connected in a series of parallel?
a)
Unscrew one light, if the other lights stay on, it's a series circuit.
b)
Unplug the strand. If the first light stays on, it's series circuit.
c)
Unscrew one light. If the other lights turn off, it's a series circuit.
d)
Cut the strand in half. If the plugged in half stays on, it's a series circuit.
26.
Direct current, DC< flows in a _______ direction while the alternating current, AC, the direction of flow _______.
a)
single, is unidirectional
b)
constant, periodically reverses
c)
opposite direction, is multiple
d)
periodically reversing, is constant
27.
The resistance of a wire is not dependent on
a)
temperature
b)
length
c)
diameter
d)
current
28.
Turning a magnet very quickly would be BEST used to create
a)
radiation
b)
light waves
c)
an electric current
d)
a convection current
29.
Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet tp pick up the most nails?
a)
water
b)
iron nail
c)
wooden stake
d)
plastic tube
30.
Why might an electromagnet be used to pick up old cards in junk yards?
a)
Electromagnets are inexpensive and easily create revenue.
b)
Electromagnets are powerful and can be turned on and off easily.
c)
Electromagnets are easy to operate and can be run by cheap labor.
d)
Electromagnets are versatile and can pick up metallic objects in the yard.
31.
In an electric motor, an electric current causes the coil to rotate, changing:
a)
magnetic energy to electrical energy
b)
electrical energy to a magnetic force
c)
potential energy to electrical energy
d)
electrical energy to mechanical energy
32.
Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips?
a)
at both poles
b)
at the South pole
c)
at the North pole
d)
in the center of the bar magnet
33.
The region around a magnet where the magnetic forces act is the
a)
magnetic domain
b)
magnetic field
c)
magnetic pole
d)
electromagnetic pole
34.
Objects that keep their magnetic properties for a long time are called
a)
electromagnets
b)
magnetic domains
c)
permanent magnets
d)
temporary magnets
35.
A device that uses an electromagnet to measure electric current is a(n)
a)
galvanometer
b)
commutator
c)
electric motor
d)
generator
36.
Electromagnetic induction is the process of producing an electric current by moving a loop of wire:
a)
through a magnetic field
b)
through a magnetc domain
c)
around an iron core
d)
around a magnetic pole
37.
The atoms in a magnet are:
a)
arranged randomly
b)
aligned according to magnetic fields
c)
negatively charged
d)
positively charged
38.
Which configuration would produce an electric current?
a)
Rotate a coil of copper wire between two magnets.
b)
through a magnetic domain
c)
Connect a wire between a copper and zinc strip sitting in a beaker of water.
d)
Connect a wire to the negative end of a battery and the other end to a light bulb.
39.
The magnetic force of a magnet is
a)
the same at all parts of the magnet
b)
strongest at the center
c)
strongest at the poles
d)
weakest at the poles
40.
All of the following use an electric motor, EXCEPT
a)
radio
b)
blender
c)
hair dryer
d)
electric fan
41.
The north pole of one magnet will be
a)
attracted to the north pole of another magnet
b)
attracted to the south pole of the same magnet
c)
repelled by the north pole of another magnet
d)
repelled by te south pole of another magnet
42.
Like magnetic poles always
a)
repel each other
b)
attract each other
c)
cancel out each other's magnetic field
d)
point towards he north pole
43.
The strength of a magnetic field created by current in a wire can be safely increased by:
a)
increasing the current in the wire
b)
decreasing the current in the wire
c)
using longer wire
d)
wrapping the wire into a coil
44.
In a magnetized substance, the domains:
a)
are randomly distributed
b)
line up more uniformly in one direction
c)
cancel each other out
d)
can never be reoriented
45.
Producing an electric current by moving a bar magnet in and out of a coil of wire is called:
a)
circuitry
b)
transformation
c)
electrostatic induction
d)
electromagnetic induction
46.
Current that does NOT reverse direction is called:
a)
alternating current
b)
circuit current
c)
direct current
d)
magnetic current
47.
The current that flows in an electric current carries:
a)
chemical energy
b)
mechanical energy
c)
thermal energy
d)
electrical energy
48.
Which factor is MOST essential for the induction of the electric current?
a)
the use of very long coils for the process
b)
the use of strong magnets for the process
c)
the use of magnetic material to make the coil
d)
the movement of the magnet relative to the coil
49.
A coil of wire, a battery, a few paper clips, and a thermometer are on a table of supplies.
What other material or materials would be needed for a student to construct a basic electric motor?
What other material or materials would be needed for a student to construct a basic electric motor?
a)
a magnet
b)
some tape
c)
an electric generator
d)
alligator clips and a plastic cup
50.
A table has several directional compasses, several lengths of wire, an iron nail, a battery, an ammeter, a light bulb, a permanent magnet, several metal and a rubber eraser. A student is asked to build an demonstrate a working temporary magnet. From the items on the table, which items can be used together to accomplish this task?
a)
A battery, and iron nail, a wire, and several paper clips will accomplish this task.
b)
An ammeter, and iron nail, a wire, and several paper clips will accomplish this task.
c)
A battery, a wire, a permanent magnet, and several paper clips will accomplish this task.
d)
A battery, an iron nail, a permanent magnet, and several paper clips will accomplish this task.
51.
What is produced by moving a permanent magnet through a coil of copper wire?
a)
electricity
b)
electromagnet
c)
light
d)
radiation
52.
In most small electric motors, the magnets that are around the central rotor (the field magnets) are ______. The magnet in the center is a(n) _____.
a)
horseshoe magnets, bar magnet
b)
bar magnets, horseshoe magnet
c)
electromagnets, permanent magnet
d)
permanent magnts, electromagnet
53.
In which way do a permanent magnet and an electromagnet differ?
a)
an electromagnet has a fixed magnetic strength
b)
a permanent magnet's strength can be changed
c)
a permanent magnet can be turned on or off
d)
an electromagnet can be turned on or off
54.
High powered electromagnets are used in recycling centers to separate iron and steel waste from plastics and paper products. You are an engineer that must increase the power of the magnet without using any additional electrical power. What modification should you make to the electromagnet?
a)
insulate the coils
b)
reduce the number of coils
c)
increase the number of coils
d)
increase the distance between the coils
55.
The battery in a cell phone provides a constant flow of electrons through conductors in the same direction to power the phone. A cell phone is powered by ____________ current.
a)
alternating
b)
direct
c)
amperes
d)
distributed
56.
As electrons flow through a circuit, the voltage remains constant. If the size of the resistor were to increase,
a)
the electrons would slow down.
b)
the electrons would speed up.
c)
fewer electrons would flow through the circuit.
d)
more electrons would flow through the circuit.
57.
A battery is used to produce a flow of electrons through this circuit. Which of these would cause more electrons to flow through the circuit?
a)
replacing the resistor with a larger one
b)
eplacing the battery with a larger one
c)
replacing the battery with a smaller one
d)
replacing the resistor with two equal resistors in series
58.
An automotive solenoid is an electromagnet that is used to start the car when the key is turned in the ignition. Which of these other parts must be connected to the solenoid in order for it to work properly?
a)
engine
b)
battery
c)
brakes
d)
heater
59.
In a simple electrical circuit, electrons flow from a battery through a resistor and back to the battery. In a plumbing system, a pump moves water through pipes. If a larger pump were used to move the water through the pipes more quickly, what electrical concept is MOST like the size of the water pump?
a)
resistance
b)
voltage
c)
current
d)
amperage
60.
An ohm is best defined as a unit of measure for
a)
power
b)
magnetic fields
c)
electrical resistance
d)
electrical potential difference
61.
In the equation for Ohm's law, I is
a)
impedance
b)
resistance
c)
impulse
d)
current
62.
How does the voltage provided by a battery vary over time?
a)
It increases gradually over time.
b)
It decreases gradually over time.
c)
It increases and decreases periodically over time.
d)
It does not vary over time.
63.
Find the current passing through a circuit consisting of a battery and one resistor. The resistor has a resistance of 2 ohms and the battery has a voltage of 12 volts.
a)
0.167 amps
b)
2 amps
c)
6 amps
d)
8 amps
64.
Which of following is a conductor?
a)
glass
b)
wood
c)
tungsten
d)
plastic
65.
Resistance in wires cause electrical energy to be converted into which form of energy?
a)
chemical energy
b)
nuclear energy
c)
thermal energy
d)
sound
66.
What happens to the magnetic forces as the distance between two magnetic poles decreases?
a)
remains constant
b)
decreases
c)
increases
d)
decreases then increases
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