Unit 12 Test Review - @cooluser

Magnetism

The force of attraction or repulsion between poles

Repel

Like poles _______.

Two new magnets are formed, each with its own north and south poles.

What happens when you break a magnet?

Attract

Opposite poles ______.

Magnetic Field

Area around magnets where magnetic forces act

the magnetic field of the magnet

Field lines around a magnet show _____.

North to South

What direction do magnetic field lines travel in? (North → South / South → North)

Magnetic Domain

An area within magnetic material where all the atoms are lined up in the same direction.

No

Is this an example of magnetized material?

Yes

Is this an example of magnetized material?

Permanent Magents

Materials whose magnetic domains are naturally aligned in the same direction.

Examples:

• Bar Magnet

• Earth

Temporary Magnets

Materials that are not magnetic but can be temporarily magnetic by forcing its atoms into alignment.

Electromagnet

A strong, temporary magnet formed when a current passes through wire coiled around an iron core.

Electromagnet

What type of electromagnet is this?

Solenoid

What type of electromagnet is this?

Solenoid

A temporary magnet formed when current is passed through wire that is NOT coiled around an iron core. (1000 times weaker than an electromagnet)

Ferromagnets

1000 times stronger than electromagnets. (Electromagnets on steroids as Mr. Siberski calls them.)

• Increase the number of coils

• Increase the voltage source

What are two ways to increase the strength of the electromagnet?

Swap the wires on the battery ends

How do you swap the poles of an electromagnet?

Circuit

The path for the flow of electrons.

(Currents are controlled with these.)

Power Source

Supplies the power for the circuit

(Ex: Battery)

Resistor

Something the resists the flow of electricity.

(Ex: Lightbulb)

Switch

Opens or closes a circuit.

Wire

Connects all of the components of the circuit.

Voltage (Measured in Volts/V)

The force at which an electric current is pushed through a circuit.

Resistance (Measured in Ohms/Ω)

The opposition to the flow of energy.

The Material, Thickness, Length, and Temperature of the wire.

What factors affect resistance?

Low

When the wire is thick, the resistance is _____.

High

When the wire is thin, the resistance is _____.

Low

When the wire is short, the resistance is _____.

High

When the wire is long, the resistance is _____.

High

When the temperature of a wire is high , the resistance is _____.

Low

When the temperature of a wire is low, its resistance is _____.

Ohm’s Law

What does the formula, V = IR, refer to?

Series Circuit

A circuit where all of the components are lined up on one continuous path

Parallel Circuit

A circuit whose components are NOT lined up on a continuous path. This circuit is similar to a ladder.

Electricity

The flow of electrons. Like charges repel and opposite charges attract.

Electrical Force

The attraction or repulsion of electrical charges.

Electric Field

The region around a charged object where an object’s force is exerted on other charged objects.

Static Electricity

Potential Electrical Energy

Electrical Current

Kinetic Electrical Energy

Law of Conservation of Charge

Charges are neither created nor destroyed, they are transferred from one object to another

Current (Measured in Amperes/Amps/a)

Flowing electricity. Measures how much electricity is in a circuit.

Direct Current (DC)

Electrons flow in a single continuous direction in a wire.

Alternating Current (AC)

Electrons move in short back-and-forth movements in a wire.