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What is an Electron?
The negatively charged part of an atom.
What is a balanced atom?
Equal number of protons and electrons.
What is a proton?
The positive charge of the atom.
if a coil has more wraps what does that mean for its magnetism?
Makes the magnetism stronger.
What does an iron core do to the inside of a coil of electrified wires?
Makes them concentrated
What happens when a magnet is cracked or broken?
Becomes two weaker magnets.
What is an insulator?
Nonmetallic substance that contains five or more electrons in its outer shell or valence.
What is a conductor?
Generally, a metallic element that contains fewer than four electrons in its outer shell or valence.
What makes copper such a good conductor?
It only has one electron on its outer most valence.
What is a free electron?
It is the outermost electron that can be moved from one atom to another.
What is a compound?
A chemically bonded union of atoms of two or more dissimilar elements.
magnetism can be used to make what?
electricity
What is current?
The flow of free electrons from one atom to another.
What is a semiconductor?
Materials that have exactly four electrons in their outer shell.
What is the force that is against the flow of electrons?
Resistance
What is the Electron Theory?
That electrons flow from negative to positive.
Magnetic force runs which way?
North to South
What is the Conventional Theory of electricity flow?
That electrons flow from positive to negative.
What is the unit of measure for current?
Ampere
What is the force that makes electricity flow?
Volts
What is the difference between Alternating Current (AC) and Direct Current (DC)?
AC current the flow of electrons goes back and forth where DC flow is only in one direction.
What is Ohms law?
One volt of electrical pressure will cause one ampere of current to flow through one ohm of resistance.
What can cause resistance in a circuit?
Smaller wire, longer wire, temperature, material of conductor.
How did the Greeks figure out how to create static electricity to pick up feathers?
Amber rubbed with fur.
What are the three letters of Ohms law and what do they stand for?
E is voltage, I is for intensity or amps, R is for resistance.