Electrical circuit: a closed loop where charged particles flow

Electrical current: a flow of charged particles (e-)

Direct current (DC): a flow of charged particles in one direction only

Alternating current (AC): a flow of charged particles in either direction (1st in one direction, then the other)

The amount of electrons that pass a given point in one second.

Current = I Unit = Ampere (amp) 1 ampere = 6,250,000,000,000,000,000

(6.25 x 1018) electrons passing a point in 1 second

1 amp = 1,000 mA

The electrical pressure or force Voltage = V Unit = volts Sometimes referred to as electric

potential difference Compare to water in a pipe: water = e-

pressure = voltage

The work performed by an electrical current

Power = P Unit = watt

The degree to which a conductor hinders the flow of charged particles

Resistance = Ohm Unit = Ω No conductor is perfect. Some current

is lost (usually to heat)

Ohm's law = the current through a conductor between two points is directly proportional to the voltage across the two points.

Formulas:P = I x V P = energy/timeV = I x RI = V / RR = V / I