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Science Chapter 8
Terms in this set (47)
The two types of magnetic poles.
The two kinds of electric charge.
Electric Charge (Vocab)
A fundamental property of matter that can be either positive or negative.
Static Electricity (Vocab)
A tiny imbalance between positive and negative charge on an object.
A flow of tiny particles that carries electrical energy in wires and machines. The particles (usually electrons) are typically much smaller than atoms and can flow around and between atoms even in solid matter. Measured in amperes.
The unit of electric current.
The unit of electrical potential energy.
Electric Current (Vocab)
A complete path through which electric current can flow.
determines how much current flows for a given voltage. Higher resistance means less current flows.
The unit of resistance.
A material with low electric resistance. Metals such as copper and aluminum are examples of these materials
A material with high electric resistance. Plastic and rubber are good examples.
The property of creating or responding to forces
Permanent Magnet (Vocab)
A material that remains magnetic without outside energy being supplied.
Magnetic Field (Vocab)
The influence created by a magnet that exerts forces on other magnets.
A magnet made with wires and electric current
Ferromagnetic Material (Vocab)
A material, like iron, which has stong magnetic properties.
Electromagnetic induction (Vocab)
Using a moving magnet to create electric current or voltage.
What are the two magnetic poles?
North and south.
Do opposites or like forces attract?
Why cant gravity repel?
Because there is only one type of mass, unlike forces where there are 2 (north and south)
What type of electricity do you use everyday
Electric current, in wires
How is current measured?
Current flows from ______ to ______ voltage.
High to Low.
Why do batteries die?
Because when a battery looses all it energy its voltage drops to zero.
What energy is stored and could be released?
Does current flow and do work?
Does a voltage difference cause current to flow?
What is a good analogy for a battery.
A water pump. Because it brings water form a position of low to high energy.
Does current flow through open or closed circuits?
Does every electrical device use current to carry energy?
Does wet or dry skin have more resistance?
Dry Skin has more
Why doesn't current leak out of an open circuit?
Because electric forces are very strong, and the huge forces between charges are the reason current cant leak out.
Are current voltage and resistance related?
Yes, 1 V creates a current 1 Amp through a distance of one Ohm.
Does a permanent magnet need outside energy to be supplied?
Does magnetic force get weaker with distance?
Where does earths magnetic field come from?
it is generated by electric currents in the conductive material of its core, created by convection currents due to heat escaping from the core.
What does an electromagnet look like?
A simple one is made of a coil of wires wrapped around and steal barrel.
What direction does a compass point to?
Permanent Magnet examples-
Bar magnet, horseshoe magnet, and magnetic materials.
What current is produced by a magnet?
What does an electric generator do?
As a magnet spins, the changing magnetism induces electric current to flow in the coil.
Whats the difference between AC and DC?
In direct current the positive terminal stays positive and the negative terminal stays negative. Alternating current constantly switches between the two.
What creates current in an atom?
What is the primary current?
What is the secondary current?
What are the two essential ideas of electricity?
(1) Current flows and does work
(2) A voltage difference causes current to flow
Recommended textbook explanations
Jerry S. Faughn, Serway
Paul G. Hewitt
Paul G. Hewitt
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