Elec & Mag Flashcards
A material’s _________________ measures how much the material opposes the flow of electric current.
Resistance
An electric current easily passes through a wire that is a ?
Conductor
A circuit that connects several objects in a single path is?
Series circuit
An object that attracts iron and steel is a _____________.
Magnet
An electric current does not pass easily through an _____________.
Insulator
The force around a magnet is________________.
Magnetism
When electric current runs through a loop of wire, it makes an______________.
Electromagnet
A small magnet that can turn freely is a ______________.
Compass
The current for each appliance has its own path in a ____________.
Parallel circuit
A machine that uses an energy source and a magnet to make electricity is a ______________.
Generator
The space around a magnet where magnetism acts is a ____________.
Magnetic field
Magnetism is strongest at the ____________ of a magnet.
Poles
When two objects have different electric charges, they ____________.
Attract or pull toward each other
Electric current is the flow of ______________.
Negative charges through matter
Electric wires are coated with plastic or rubber because these materials are ________________.
Insulators
Every time you turn on a light, you open or close a circuit __________.
Close a circuit
When you turn off one light, all the lights in the room go off. This is an example of a series or parallel circuit _____________.
Series circuit
If you hold the south poles of two magnets near each other, what will happen?
The poles will repel or push away
Most electric generators make electricity using _____________.
A magnet and an energy source
The invention of the compass shows the earth acts like a giant ______________.
Magnet
When you rub two balloons together, ____________ charges can move from one to the other.
Negative
The flow of negative charges through matter is called ____________.
Electric current
Electric current only flows through a circuit when it is open or closed?
Closed
The northern lights are caused by the earth’s _______________.
Magnetic field
A machine that produces electricity is a _____________.
Generator
When two objects have different electric charges, they _________.
Attract or pull together
The purpose of insulation on a wire is to ___________.
Make the electric current stay on its path
Which of these substances is the best conductor of electricity?
A. Air B.rubber C. Plastic D. Metal
D. Metal
Electric current will flow through a circuit as long as the path is_____.
Unbroken or closed
What is a parallel circuit?
Each object has its own electrical path
If a magnet is allowed to swing freely, the north-seeking pole will point ____________.
North
The northern lights are caused when?
Charged particles form a pattern around the earth’s magnetic poles
Electric current can be generated by?
Sliding back and forth or turning a magnet through a coil of wire
Electromagnet is created when _______________ flows through a coil wire.
Electricity
When you push a doorbell, you are opening or closing a circuit?
Closing
As you rub a balloon on your sleeve, it picks up _________ charges.
Negative
If you sprinkle tiny pieces of iron over a magnet, the pattern formed shows a _________________.
Magnetic field
How did Hans Christian Oersted discover that electricity and magnetism are related?
While experimenting with electric circuits he discovered that electric current could make a compass needle move.
You walk across a thick carpet and reach out to turn on a light switch. Why do you feel a shock?
Your body picks up negative charges which move from your hand to the switch.
How are electromagnets used to make electric power?
Generators have huge electromagnets with huge coils of wire and magnets. They use a power source to move the magnet and produce electricity.
Name three power sources for a generator.
Wind, water, steam, nuclear or burning of coal, gas, or oil
