Vocabulary 1
Material that resists but doesn't stop the flow of electric current
resistor
Object that attracts things made of iron or steel
magnet
Arrangement of wire wrapped around a core
electromagnet
An object has a ________ charge if it has more negative particles than positive particles.
--large
--negative
--neutral
--positive
negative
Electromagnets in motors are used to cause--
-- heat
-- circuits
-- light
-- motion
motion
Flow of electric charges
electric current
Space around an object where electric forces occur
electric field
Material that electric current cannot easily pass through
insulator
When two objects both have positive charges, the objects --
--neutralize each other
--repel each other
--exchange negative particles
--attract each other
repel each other
Which of the following is NOT a good way to control an electromagnet?
-- decrease the amount of current
-- heat or cool it
-- add coils of wire around the core
-- turn the current on and off
heat or cool it
Space around a magnet where the force of the magnet acts
Ends of a magnet
magnetic poles
Circuit with one path for electric current
series circuit
Copper wire in a circuit ________ electricity.
--energizes
--insulates
--conducts
--resists
conducts
A device that produces motion energy from electrical energy is--
-- a motor
-- an electromagnet
-- a generator
-- a compass
a motor
Supplies energy to move charges through a circuit
electric cell
Path made for an electric current
circuit
Charge that stays on an object
static electricity
A bar magnet's pull is strongest--
--in the middle
--at both poles
--at the N pole
--at the S pole
at both poles
What two magnets make a compass work? How do they interact?
The Earth is like a giant magnet, and the compass has a magnet in its needle. The north-seeking pole of the compass magnet is attracted to the Earth's North Pole. This makes the compass needle point north.
Measurement of an object's extra positive or negative particles
charge
Material that electric current can pass through easily
conductor
Circuit with more than one path for electric current
parallel circuit
--opposite poles
--only the N poles
--only the S poles
--their middles
opposite poles
In what ways are electricity and magnetism alike?
They both produce a force that can pull or push things without touching them. They both have opposite states: electricity has positive and negative, and magnetism has north-seeking and south-seeking. In both, opposite states attract and same states repel.