Voltage, current and resistance

The voltage (V) between two points is the cost in energy necessary to move a unit of positive charge from the more negative point to the more positive point. It is measured in voltage.

Current (I) is the flow of charge past a given point. It is measured in amperes.

All elements in an electronics circuit has resistance, even the conductors (wires or PCB traces). Resistance is measured in Ohms (Ω).

Ohm’s law states that I = V/R. That formula derives into V = I*R and R = V/I.


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