- Voltage: (V or v - Volts) The electrical potential between two points in a circuit.
- Current: (I or i - Amperes) The amount of charge flowing through a part of a circuit.
- Power: (W - Watts) Simply P = IV. It is the current times the voltage.
- Source: A voltage or current source is the supplier for the circuit.
- Resistor: (R measured in Ω - Ohms) A circuit element that "constricts" current flow.
Ohms law or equivalently or
Resistors in series
Voltage Divider
Resistors in Parallel
and for the special case of two resistors in parallel:
Kirchhoff’s Voltage law: The algebraic sum of the voltages around a closed circuit path must be zero.
Kirchhoff’s Current Law: The sum of the currents entering a particular point must be zero.
Capacitors in an AC circuit:
In parallel:
In series
Inductors in an AC circuit:
In parallel:
In series:
Special case: Two straight parallel wires