Coupling is also the transfer of electrical energy from one circuit segment to another. For example, energy is transferred from a power source to an electrical load by means of conductive coupling, which may be either resistive or hard-wire. An AC potential may be transferred from one circuit segment to another having a DC potential by use of a capacitor. Electrical energy may be transferred from one circuit segment to another segment with different impedance by use of a transformer; this is known as impedance matching. These are examples of electrostatic and electrodynamic inductive coupling.
- Electrodynamic induction — Commonly called inductive coupling, also magnetic coupling.
- Electrostatic induction — Commonly called capacitive coupling.
- Evanescent wave coupling
- Radio waves — Wireless telecommunications.
- Electromagnetic interference (EMI) — Sometimes called radio frequency interference (RFI), is unwanted coupling. Electromagnetic compatibility (EMC) requires techniques to avoid such unwanted coupling, such as electromagnetic shielding.
- Microwave power transmission
Other kinds of energy coupling:
- Antenna noise temperature
- Coupling loss
- Aperture-to-medium coupling loss
- Coupling coefficient of resonators
- Directional coupler
- Equilibrium length
- Fiber-optic coupling
- Loading coil
- List of electronics topics
- AC Coupling
- Impedance matching
- Impedance bridging
- Wireless power transfer