A
What is an electric charge?
A property of matter that causes electrical phenomena.
What are Electric forces?
Attractive or repulsive noncontact forces between charged particles.
What are the two kinds of electric charge?
positive and negative
What charges are likely to demonstrate attractive forces?
A positive and negative charge
When are electric forces repulsive?
when they have the same kind of charge
A neutral object is an object that has what?
An equal number of positively and negatively charged particles.
What is the difference between insulators and conductors?
Insulators have high resistances while conductors have low resistances.
What two things would cause something to be MOST strongly attracted to a negatively charged object?
a large positive charge that is nearby
Electricity moves out of and into which ends of a battery?
Out of the negative end and into the positive end
How does distance affect the strength of an electric force?
Electric forces that are closer together are stronger.
How is an electric field represented in a field diagram?
With arrows
Most metals are conductors, an exception to this is...
Water
What happens to the strength of electrical forces as they are moved apart?
The strength of electric forces decrease with the distance between objects.
An object with a lot of charge is likely to
exert a strong electric force.
In what situation does a charged object create an electric field?
A charged object always creates an electric field.
Why do wires have plastic wrapped around copper on the inside?
The plastic is an insulator and stops electricity from reaching who is touching the wire
Cheng rubs a balloon on a wool sweater and then holds it next to another balloon. The other balloon moves away from the balloon he is holding. What hypothesis might Cheng be testing?
What happens when a charged balloon is placed near another charged balloon?
The more lightbulbs you plug into a circuit with a single battery makes the brightness of all the lights...
Decrease
An electric current is
a flow of particles with electric charge.
If a negatively charged ball hanging from a stick is brought closer to a positively charged balloon, what would the ball hanging from the stick most likely do?
The ball would swing away from the balloon as it got closer.
The amount of electrical "pressure" a battery gives off is called...
Voltage
What is likely to happen to an electric current flowing through an electric device if the wires are disconnected?
The circuit would break, and the current would stop flowing.
Which of the following most represents a field diagram of a negatively charged test object?
The arrows in the field diagram point toward the object.
Which of the following most represents a field diagram of a positively charged test object?
The arrows in the field diagram point away from the object.
A scientist is experimenting with a positively charged balloon. What effect would happen to this balloon if she placed it in an electric field?
The balloon would move toward the negatively charged side of the field.