Conductors are types of material that charges can move through __________.
easily
100
An electromagnet is what?
A magnet that has coils of current-carrying wire around an iron core.
100
When we used the ENERGY STICK, what was the conductor?
We were!
200
What kinds of charges move?
Negative charges (or electrons)
200
An electric CIRCUIT is what?
A continuous pathway that can carry an electric current.
200
Insulators are materials that _________ the flow of electricity.
resist
200
Provide ean xample of an electromagnet used in the real world.
Electromagnet crane in junkyards
200
In a POTATO CLOCK, the potatoes act as what?
A battery
300
An electric charge is ________?
A basic property of the tiny particles that make up matter. Electric charges can be positive or negative.
300
What is the main difference between series and parallel circuits?
A series circuit has only one path for the charges to travel. A parallel circuit has more than one path for the charges to travel.
300
True or false:
Electrical applicanes (like ovens and microwaves) have both conductors and insulators inside them.
True
300
What are the two ways to make electromagnets stronger?
Use a more powerful power source and more coils around the iron core.
300
Why do we use electrical tape and not masking tape when insulating wires?
To prevents fires. Electrical tape is designed to be wrapped around conductors.
400
Charges _________ when the charges are the same.
Charges _________ when the charges are the opposite.
repel; attract
400
Why are electrical cords covered in plastic or rubber insulation? Provide two reasons.
To prevent short circuiting and to protect people from harm.
400
Charges don't really "flow" through conductors. Instead they are _______ ___________.
pushed through
400
The "device" that is being powered in a circuit is called a _______.
load
400
What is a fuse?
A fuse contains a substance that melts onto a circuit if it gets too hot.
500
What makes a balloon stick to a wall?
Once a charge is built up on the balloon, it's negative charges repel the negative charges on the wall, leaving the positive charges. The negative balloon charges and the wall's positive charges attract.
500
True or false:
The higher the resistance, the more charges move in a circuit.
False.
High resistance, low "flow" of charges
500
The most common type of material used as conductors in wiring is __________. Even though _________ is a better conductor, it is more ____________.
copper; silver; expensive
500
In theory, the more coils around the iron core, the _________ the magnetic field.
(a) stronger
(b) weaker
(c) hotter
(d) insulated
(a) stronger
500
Which of these metals has the lowest resistance?
Iron, copper, silver or lead?