Elec & Mag

Question 0

A material’s _________________ measures how much the material opposes the flow of electric current.

Answer 0

Resistance

Question 1

An electric current easily passes through a wire that is a ?

Answer 1

Conductor

Question 2

A circuit that connects several objects in a single path is?

Answer 2

Series circuit

Question 3

An object that attracts iron and steel is a _____________.

Answer 3

Magnet

Question 4

An electric current does not pass easily through an _____________.

Answer 4

Insulator

Question 5

The force around a magnet is________________.

Answer 5

Magnetism

Question 6

When electric current runs through a loop of wire, it makes an______________.

Answer 6

Electromagnet

Question 7

A small magnet that can turn freely is a ______________.

Answer 7

Compass

Question 8

The current for each appliance has its own path in a ____________.

Answer 8

Parallel circuit

Question 9

A machine that uses an energy source and a magnet to make electricity is a ______________.

Answer 9

Generator

Question 10

The space around a magnet where magnetism acts is a ____________.

Answer 10

Magnetic field

Question 11

Magnetism is strongest at the ____________ of a magnet.

Answer 11

Poles

Question 12

When two objects have different electric charges, they ____________.

Answer 12

Attract or pull toward each other

Question 13

Electric current is the flow of ______________.

Answer 13

Negative charges through matter

Question 14

Electric wires are coated with plastic or rubber because these materials are ________________.

Answer 14

Insulators

Question 15

Every time you turn on a light, you open or close a circuit __________.

Answer 15

Close a circuit

Question 16

When you turn off one light, all the lights in the room go off. This is an example of a series or parallel circuit _____________.

Answer 16

Series circuit

Question 17

If you hold the south poles of two magnets near each other, what will happen?

Answer 17

The poles will repel or push away

Question 18

Most electric generators make electricity using _____________.

Answer 18

A magnet and an energy source

Question 19

The invention of the compass shows the earth acts like a giant ______________.

Answer 19

Magnet

Question 20

When you rub two balloons together, ____________ charges can move from one to the other.

Answer 20

Negative

Question 21

The flow of negative charges through matter is called ____________.

Answer 21

Electric current

Question 22

Electric current only flows through a circuit when it is open or closed?

Answer 22

Closed

Question 23

The northern lights are caused by the earth’s _______________.

Answer 23

Magnetic field

Question 24

A machine that produces electricity is a _____________.

Answer 24

Generator

Question 25

When two objects have different electric charges, they _________.

Answer 25

Attract or pull together

Question 26

The purpose of insulation on a wire is to ___________.

Answer 26

Make the electric current stay on its path

Question 27

Which of these substances is the best conductor of electricity? A. Air B.rubber C. Plastic D. Metal

Answer 27

D. Metal

Question 28

Electric current will flow through a circuit as long as the path is_____.

Answer 28

Unbroken or closed

Question 29

What is a parallel circuit?

Answer 29

Each object has its own electrical path

Question 30

If a magnet is allowed to swing freely, the north-seeking pole will point ____________.

Answer 30

North

Question 31

The northern lights are caused when?

Answer 31

Charged particles form a pattern around the earth's magnetic poles

Question 32

Electric current can be generated by?

Answer 32

Sliding back and forth or turning a magnet through a coil of wire

Question 33

Electromagnet is created when _______________ flows through a coil wire.

Answer 33

Electricity

Question 34

When you push a doorbell, you are opening or closing a circuit?

Answer 34

Closing

Question 35

As you rub a balloon on your sleeve, it picks up _________ charges.

Answer 35

Negative

Question 36

If you sprinkle tiny pieces of iron over a magnet, the pattern formed shows a _________________.

Answer 36

Magnetic field

Question 37

How did Hans Christian Oersted discover that electricity and magnetism are related?

Answer 37

While experimenting with electric circuits he discovered that electric current could make a compass needle move.

Question 38

You walk across a thick carpet and reach out to turn on a light switch. Why do you feel a shock?

Answer 38

Your body picks up negative charges which move from your hand to the switch.

Question 39

How are electromagnets used to make electric power?

Answer 39

Generators have huge electromagnets with huge coils of wire and magnets. They use a power source to move the magnet and produce electricity.

Question 40

Name three power sources for a generator.

Answer 40

Wind, water, steam, nuclear or burning of coal, gas, or oil