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Battery Polarity
Batteries have 2 poles; positive and negative. Positive is called carbon anode.
Negative is called zinc cathode. This is only for dry celled batteries though.
Wet cells were bottles with liquid inside that had to be handled well to avoid
spillage.
Earth's Magnetic Field In a Nutshell:
The field is caused by swirling iron in the outer core. This causes a magnetic
field with a north and south pole, just like a magnet only without one. The
North and South poles are 2 things: geographic points where the imaginary
axis goes through. The 2nd one is the magnetic pole. These poles are close,
but not the geographic ones. That means compasses are always pointing to
the magnetic poles, not the geographic, which could be quite a problem near
either pole. Either way the field attracts a compass toward the north or south
pole; depending on which hemisphere you are in. Then you can tell which
direction the magnet's is pointing.
Circuit Theory:
The theory of work being able to be accomplished by routing matters through
a loop.
The three types of matter used:
electronic or electrical circuits(electrons and charged ions)
pneumatic circuits: compressed gas
hydraulic circuits: pressured liquids
Ohm's Law:
I(current)=V(Voltage)/R(Resistance)
boldsymbol{J} = sigma boldsymbol{E},Where J is the density at any moment of
any resistant material, E is the electric field at that location, and σ is a material
dependent parameter called the conductivity.
Ampere:
An ampere, usually known as an amp, is an SI base unit. It is named after
André-Marie Ampère, one of the main discoverers of electromagnetism. It is a
measure of the amount of electric charge that passed under a point in a
certain amount of time. Around 6.242 × 10^18 electrons passing a given point
each second constitutes one ampere.