This picture shows a turbine generator used to produce electricity at a geothermal power plant. Electricity is produced by using steam to _____________.

reduce friction in the turbine generators

reduce emissions from the turbine generators

What would happen if you broke a bar magnet into 8 pieces?

You would have 8 complete magnets

You would have 4 complete magnets

They wouldn't be magnets anymore

Why did this simple electric motor work?

The current from the battery induces a magnetic field in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

The electromagnet on top of the battery pulls on the magnetic copper wire

The magnet induces a current in the copper loop which makes it rotate.

The magnetic field from the battery induces an electric current in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

How are electromagnets different from permanent magnets?

you can turn an electromagnet on/off

magnets have a North and South pole

Which of the following is the most appropriate definition for magnetic field?

an area of magnetism surrounding a magnet that applies a force (a push or pull) without actually touching an object

an area surrounding a magnet that does not apply a force (a push or pull)

an area directly on the magnet that applies a force (a push or pull) without actually touching an object

an area surrounding a magnet that applies a force (a push or pull), but only by directly touching an object

What makes an electromagnet different than a permanent magnet.....select all that apply

its strength can be increased and decreased

it does not need any electricity

Which way will NOT increase the strength of the magnetic field of an electromagent

using a stronger ferromagnetic core

winding the coils closer together

Moving a permanent magnet through a coil of wire will

a current will be generated in the wire

the wire will become an electromagnet

the magnet will become electrified

To reverse current direction in a motor the conducted current goes

through the brushes to the commutator

through the commutator to the armature

Colby wants to accomplish a goal of designing an electric generator to charge his phone on family camping trips. He has learned about generators in science class and knows the basic parts he will need. He gathers together a strong magnet, a piece copper wire and a galvanometer. In his first investigation he wants to measure the amount of electricity he can produce using his materials. What should he do with his materials to ensure he is producing the most electricity? Select the three answer choices that correctly outline the steps he should take

Shape the wire into coils wide enough for the magnet to pass through

Move the magnet through the wire quickly

Connect the ends of the wire to the galvanometer

Coil the wire tightly around the magnet so the magnet does not fall out

Place the magnet on top of the galvanometer

The Hoover Dam produces about 4.2 billion kilowatt-hours of energy each year, using flowing water to rotate fan-like blades in turbine generators. Which of the following summarizes the production of energy at Hoover Dam?

Mechanical energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

Mechanical energy of the flowing water is transformed into thermal energy by rotating coils in a magnetic field, producing a direct current.

Thermal energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

Thermal energy of the flowing water is transformed into mechanical energy by rotating coils in a magnetic field, producing a direct current.

Which conclusion is supported by the data?

The magnetic field produced is directly proportional to the number of coils.

The magnetic field produced is inversely proportional to the length of the wire.

The electric field produced is directly proportional to the length of the wire.

The electric field produced is inversely proportional to the number of coils.

magnetism review

Authored by Jamie Wright

Science, Physics

NGSS covered

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34 questions

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

electric generators converts mechanical force into

mechanical energy

magmatism

electric current

electric energy

MULTIPLE SELECT QUESTION

45 sec • 1 pt

what is electromagnetic induction

when you induce magnets

when you use chemicals to make science

the ability to use an electrical current to create a magnetic field and vise versa

the ability to use an magnetic field to create an electrical current and vise versa

Tags

NGSS.HS-PS2-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

what did Hans Orsted discover

wires

a magnetic field

a magnetic field that could create wires

that a current in a wire could create a magnetic field

Tags

NGSS.HS-PS2-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

can a magnetic field cause an electrical current

true

false

Tags

NGSS.HS-PS2-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

how can you make electro magnet

string, pencil, wire

battery, nail, string

battery, nail, wire

battery, pencil, wire

Tags

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

what device is made of coils of wire with an electrical current in order to generate magnetic field

magnet

electron magnet

electrons

electromagnet

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

what two forces are required for generators electric motors to work

chemical and thermal energy

magnetism and thermal energy

thermal and electric energy

electrical and magnetism

Tags

NGSS.MS-PS2-3

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