# Electricity and Magnetism

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```					Electricity and Magnetism
Voltage (V) is the pressure that makes electricity move.
1. Electricity can be thought of as water.
a. The higher the water tank, the more water pressure
b. The thicker the pipes, the more water can move
through.
c. The more resistance to water flow, the less will move
d. Hoses must be connected to circulate water
e. Water must be pumped to move
Batteries are the “pump” that makes electricity move.
1. Batteries do not “make” electricity, they release it from
chemical bonds
2. Batteries do not “store” electricity, they release it from
chemical bonds
3. Batteries come in two flavors
a. Dry cell ~ like flashlight batteries. They are dry
inside.
b. Wet cell ~ like car batteries. They have strong, very
strong acid inside.
Three things have to be known about electricity, to make
much sense of it.
Resistance ~ the frictional forces slowing the movement of
electricity. It is shown as “Ω”, and is an ohm, or “R”.
Voltage difference ~ how much pressure is in a line. It is
shown as “V”, or “V”.
Current ~ how much electricity actually gets through, it is
shown as “A” or “I”.
Ohm’s law says that
Voltage Difference
Amps = --------------------------------------
Resistance

So... How much current will get through a circuit with
2 Ω of resistance and 24 V of electrical pressure?
Ohm’s law says that
Voltage Difference
Amps = --------------------------------------
Resistance

So... How much current will get through a circuit with
2 Ω of resistance and 24 V of electrical pressure?
24 V ÷ 2Ω = 12 amps.
Magnetism
1. Closely related to electricity, in fact one of the 4 forces of
nature is the electromagnetic force.
Magnetism
1. Closely related to electricity, in fact one of the 4 forces of
nature is the electromagnetic force.
2. Magnetism moves by force “fields”
a. There is no particle of magnetism, like an electron
with electricity.
Magnetism
1. Closely related to electricity, in fact one of the 4 forces of
nature is the electromagnetic force.
2. Magnetism moves by force “fields”
a. There is no particle of magnetism, like an electron
with electricity.
b. There are always two poles, always.
I.     North and South
II.    Cannot be separated
Magnets come in two types.
1.    Electromagnets
2.    Permanent magnets
Magnets come in two types.
1.    Electromagnets
2.    Permanent magnets
Permanent magnets
have “domains” that                 QuickTime™ and a
TIFF (Un compressed) decompressor
are neede d to see this picture.
line up north to south,
and amplify the
magnetic effect.

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