Alternating Current: an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.
Ampere: a unit of electric current equal to a flow of one coulomb per second.
Diode: a semiconductor device with two terminals, typically allowing the flow of current in one direction only.
Direct Current: an electric current flowing in one direction only.
Electric Current: An Electric Current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma.
Electric Power: Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
Electric Resistance: Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it. The resistance is measured in units of ohms (Ω).
Ohm: the SI unit of electrical resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt.
Ohm's Law: Ohm's law definition. The resistor's current I in amps (A) is equal to the resistor's voltage VR=V in volts (V) divided by the resistance R in ohms (Ω): V is the voltage drop of the resistor, measured in Volts (V).
Potential Difference: the difference of electrical potential between two points.
Voltage Source: A Voltage source is a two terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current.