Magnetism
Earth's Magnetic Field
Currents
Electricity & Magnetism
Devices
100
This is the place on a magnet where the lines of force of a magnet are the strongest.
What are the poles?
100
This a group of atoms with their fields pointing in the same direction.
What is magnetic domain?
100
This is what an object that has kinetic energy must be doing.
What is in motion?
100
This happens to an electromagnet when it is disconnected to a battery.
What is "turns off" or "quits working"?
100
This device uses a magnetic field to turn motion into electricity.
What is a generator?
200
Magnetic force is exerted through this.
What is a magnetic field?
200
This is the name for Earth's magnetic field.
What is the magnetosphere?
200
This is what is made when an electric current flows back and forth in a circuit.
What is alternating current?
200
A magnetic field exists around a wire in an electromagnet whenever this happens.
What is electric current flows through the wire?
200
This device is created by wrapping wire around an iron core and attaching it to a power source.
What is an electromagnet?
300
This is what happens when two north poles of a bar magnet are brought together.
What is repel?
300
The aurora (Northern Lights) are produced when Earth's magnetic field interacts with this.
What are electrically charged particles from the Sun?
300
This is how current can be produced in a wire that moves in a magnetic field.
What is "as the wire moves, the electrons in the wire also move in the same direction"?
300
This is what the center of an electromagnet is usually made of.
What is iron?
300
This device converts mechanical energy into electric energy.
What is an electric motor?
400
This is what the domains in a fully magnetized iron nail would look like.
What are "arranged in a straight line", or "all lined up the same direction"?
400
This is why a magnetized iron needle floating in water would continually point in the same direction even after turning the container around.
What is "the magnetized needle has created a compass and is always pointing north"?
400
This is how currents flow in a direct current and an alternating current.
What is "the current flows in only one direction in a direct current, and the current flows back and forth in an alternating current"?
400
These are some examples for uses of electromagnets.
What are doorbells, gas gauges in a car, or magnets used to pick up cars in a junkyard?
400
A transformer is a device that changes the voltage of an alternating current with little loss of energy. This is what they are used for.
What is "transformers are used to increase the voltage before transmitting an electric current through power lines, and used to decrease the voltage to the level needed for home use"?
500
This is the reason two horse shoe magnets would be attracted to each other if the left magnet's top pole is labeled "N."
What is the other left pole is labeled "S." Because opposites attract, the magnetic poles must be the other pole.
500
Taking 2 positively charged objects and holding them close to one another creates a system with electric potential energy. This is one way to lower the electric potential energy in a system.
What is "increase the distance between the 2 charges"?
500
This is the flow of energy through a motor made of a battery, wires, rotor (moving part), a magnet and a base to put it on.
What is "the power runs from the battery, through the wires to the rotor, and through the magnet creating mechanical energy"?
500
This would make an electromagnet stronger.
What is increase the voltage (power) of the battery or increase the number of coils around the iron core?
500
This is the comparison of an electric motor to an electric generator.
What is "a generator uses a magnetic field to create electricity, while a motor uses the electricity to create kinetic energy (movement)?"