comes from an imbalance of electrons and protons; causes things to attract or repel
the force caused by electric charge; opposites attract and like charges repel
Units for charge
Electric force and distance
Stronger at close distances, weaker at long distances
The potential energy caused when electric charges have the chance to make an electric force; also called VOLTAGE
the rate that electric charges move through a conductor
current = charge/time
I = q/t
negative charge carriers; the flow of electrons is what causes current
conducts electricity and allows electrons to flow through it (metals, humans, water)
do not conduct electricity (rubber, plastic, air, non-metals
Field lines come out of...
Field lines point to...
A positively charged object will move _______ along a field line
A negatively charged object will move _______ along a field line
When charges are stronger... (what do we do with field lines?)
draw more field lines
Rule for drawing field lines
they NEVER cross
the capacity to do work
all mass is attracted to all mass; height represents potential energy
the difference in electrical potential energy between two places in a circuit; tells you which way charges want to move and how badly (like a map of where charges want to go)
Units for current
is caused by internal friction that slows down the movement of charge through a conductor
very high resistance
medium resistance; resistance can be changed
V = IR
Voltage (electric potential) =
Current x Resistance
Ohms (Ω say "omega")
insulators in their natural state, but can be manipulated so that sometimes they conduct, and sometimes they don't
Semiconductors on the periodic table
Can be found right on the line between metals and non-metals
A train that floats above a magnetic track; the tracks are superconductors
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