SCIENCE TEST

The magnetic field of a solenoid can be increased by adding more loops per meter putting a rubber core inside the coil removing the iron core decreasing the current

Adding more loops per meter

Which of the following actions will decrease the strength of the magnetic field of an electromagnet? decreasing the current in the wire using fewer loops of wire per meter all answer choices apply removing the iron core

All answer choices apply

What do all electric motor have

Armature

A student attaches a meter to a wire coil. Next, the student spins a magnet inside the coil. As the magnet spins, the meter indicates... volume temperature conductivity current

Current

What does a step-down transformer do?

Decreases voltage and increas current

What is created when a magnet moves through a coil of wire? a. ferromagnet b. an electric current c. an electromagnet d. a solenoid

Electric current

movement of electrons through a material

Electric current

device that converts electric energy into mechanical energy

Electric motor

Which of the following is true about the relationship between electricity and magnetism? Magnetism is based on how gravity attracts electrical energy. Magnetism and electricity cannot be converted into one another. Electricity can be used to create a magnet. Electrical energy and magnetism cancel each other out.

Electricity can be used to create a magnet.

Which of these statements describes how an electric motor works? Electricity is used to move a turbine. Electricity creates a magnet that causes other parts of the motor to move. A permanent magnet is turned into an electromagnet using electricity. Moving turbines cause magnets to move, producing electricity.

Electricity creates a magnet that causes other parts of the motor to move.

A coil that has an iron core and that acts as a magnet when an electric current is in the coil Solenoid Electric motor Generator Electric motor Electromagnet Transformer Galvanometer

Electromagnet

metal object that acts as a magnet when an electric current moves through it

Electromagnet

Electricity is the flow of....

Electrons

Where are ammeters found

Galvometers

device that converts mechanical energy into electrical energy

Generator

What does a step-up transformer do?

Increases voltage and decreases current

What does a Galvanometer meter have

It has an electromagnet placed between the poles of a permanent magnet.

set of lines that defines the motion of charged particles near a magnet

Magnetic field

What is a galvanometer?

Measures current

metal object that acts as a magnet when an electric current moves through it

Mechanical energy

What kind of energy transformation takes place in a generator? mechanical to chemical electrical to mechanical mechanical to electrical electrical to chemical

Mechanical to electrical

material that is difficult to magnetize; will maintain magnetism for a long period

Permanent magnet

A coil of wire with an electric current in it Solenoid Voltmeter Electric motor Electromagnetism Generator Transformer Electromagnet

Solenoid

A coil of wire with an electric current in it is called a(n) a. transformer b. solenoid c. electric motor d. electric generator

Solenoid

long coil of wire used to create a magnetic field

Solenoid

How can a magnet be used to produce an electric current? Wrap wire around the magnet. Hold the magnet next to a wire. Spin the magnet around inside a coil of wire. Connect a wire to each end of the magnet.

Spin the magnet around inside a coil of wire

Increasing the electric current in the wire is one way to..... a. the magnetic forces b. the magnetic field lines c. the north and south poles d. the areas called domains

Strengthen a solenoids magnetic field

material that can take on magnetic properties quickly; also loses them quickly

Temporary magnet

How does an electric generator work

The electric current produced by a generator changes direction each time the coil makes a half turn. Because the electric current changes direction, it is an alternating current.

How do you generate electrical energy

The energy that generators convert into electrical energy comes from different sources such as fossil fuels and nuclear energy.

How does a transformer work?

The number of loops in the primary and secondary coils of a transformer determines whether it increases or decreases the voltage.

CAUSE: AN Electrical current enter a simple electric motor Effect: The simple electric motor converts the electrical current into mechanical energy. The simple electric motor converts the electrical current into chemical energy. The simple electric motor converts the electrical current into solar energy. The simple electric motor converts the electrical current into light energy.

The simple electric motor converts the electrical current into mechanical energy.

Fischer has an iron nail, a metal wire, and a battery and connects them. Fischer moves a few iron fillings toward the set-up. What would MOST LIKELY happen to the iron filings? They will be attracted to the nail. They will be attracted to the battery. They will be repelled from the nail. They will be repelled from the battery.

They will be attracted to the nail

Long distance electrical transmission is best achieved if the voltage of electrical current is increased to thousands volts. What component in the electrical grid performs this functions? junction box substation generator transformer

Transformer

A temporary magnet can quickly become magnetized. True False

True

Magnetic force is stronger the closer the magnets are brought together. True False

True

What is an electric motor

a device that changes electrical energy into mechanical energy

What is an electric Generator

a device that converts mechanical energy into electrical energy

What is a transformer?

a device that increases or decreases the voltage of an alternating current

What is an armature

a loop or coil of wire that can rotate

When an electric current flows through a wire: a gravitational field is created around the wire. a magnetic field is created around the wire. the wire becomes very cold. the wire begins to spin.

a magnetic field is created around the wire.

A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is called a(n) a. ferromagnet b. permanent magnet c. electromagnet d. temporary magnet

electromagnet

What can demagnetize a magnet? a. high temperatures b. high altitudes c. low temperatures d. low altitude

high temperatures

A compass needle responds to magnetic field, because the compass needle is a a. magnet b. transformer c. motor d. generator

magnet

What can you make visible by sprinkling iron filings around a magnet? a. the magnetic forces b. the magnetic field lines c. the north and south poles d. the areas called domains

magnetic field lines

As electrons move, they make As electrons move, they make a. ferromagnetism b. electromagnetism c. auroras d. magnetic fields

magnetic fields

Increasing the number of loops per meter in the coils of a solenoid is one way to a. weaken the solenoid's magnetic field b. strengthen the solenoid's magnetic field c. increase the wire's electric current d. decrease the wire's electric current

strengthen the solenoid's magnetic field

Whether material is magnetic or not depends on which of the following? a. the material's weight b. the material's atoms c. the material's density d. the material's mass

the material's atoms

device that increases or decreases the voltage of alternating current

transformer

If you were to cut a magnet in half... you would have two smaller magnets, each with a north and south pole you would have demagnetized it you would have separated the north pole from the south pole nothing would happen

you would have two smaller magnets, each with a north and South Pole