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Current
The flow of electric charge through a circuit, caused by the movement of electrically charged particles, such as electrons. Measured in amperes (A)
Frequency
The rate at which an electrical signal alternates between positive and negative per second, measured in hertz (Hz).
Resistance
The opposition to the flow of electrons in an electrical circuit. It can be calculated using Ohm’s Law, which relates resistance (R), voltage (V), and current (I): R=V/I. Measured in ohms (Ω)
Voltage
The electromotive force from a power source that pushes electrons through a circuit, often described as electric pressure. Measured in volts (V)