Electrical charge flow past a given point per unit of time.
Direct current:
Electrical current that flows in only one direction.
Alternating current:
Electrical current that oscillates forward and backwards.
Voltage:
The ratio of electric potential energy to electric charge at
a particular spot in an electric field. It is often referred to
as voltage since it is measured in volts.
Ohm�s law:
Basic law that describe current electricity; Voltage equals
current times resistance.
Internal resistance:
Resistance from the processes inside a voltage source;
reistance due to the battery itself.
Series circuit:
A circuit where the components form one continuous loop.
The current is constant throughout.
Parallel circuit:
A circuit where each component is connected to form its own
separate independent branch. The voltage is constant
throughout.
Fuse/Circuit breaker:
A safety device designed to melt or disconnect a circuit
after a predetermined amount of current is exceeded.
Junction rule:
A restatement of conservation of charge; the current going
into a junction must equal the current going out of the
junction.
Loop rule:
A restatement of conservation of energy; the sum of all
voltages in the elements of a loop is zero.
