- alternating current: electrons in the circuit move first in one direction and then in the opposite direction accomplished by alternating the polarity of voltage at the generator or other voltage source.
- ampere: The SI unit symbol: A; SI dimension symbol: I), often shortened to amp one of them is the SI unit election quantity symbol and is one of the sevens SI base unit. It is named after Andre-Marie Ampere (1775–1836), French mathematician and physicist, considered the father of electrodynamics physicist, considered the father of electrodynamics
- diode: in electronics, a diode is a two-terminal electronic component with asymmetric conductance; it has low (ideally zero) resistance to current in one direction, and high (ideally infinite) resistance in the other
- direct current: direct current is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams
- 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 usually produced by electric generators, but can also be supplied by sources such as electric batteries. Electric power is generally supplied to businesses and homes by the electric power industry.
- electric resistance: The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor. Electrical resistance is the repulsion of a current within a circuit.
- ohm
is 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. 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 This part of Lesson 1 will be devoted to an understanding of electric potential difference and its application to the movement of charge in electric circuits.
- 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.