Electrical Engineering/Quick Reference
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Basics[edit | edit source]
- 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
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[edit | edit source]
In series
Inductors[edit | edit source]
Inductors in an AC circuit:
In parallel:
In series:
Ampere’s Force Law[edit | edit source]
Special case: Two straight parallel wires