Voltage
- Denoted ∆V and measured in units of electric potential: volts, or joules per coulomb
- Voltage is a representation of the electric potential energy per unit charge.
- Voltage is equal to the work done per unit charge against a static electric field to move the charge between two points
- A voltage may represent either a source of energy (electromotive force)
- Voltage can be caused by static electric fields, by electric current through a magnetic field
- Net amount of charge (coulombs) (number of electrons x electron charge)flowing past a specified point during a time interval (seconds), usually measured in Amps ( 1Amp = 1coulomb/1second). In typical components and systems the quantity of electrons is quite large and the aggregate charge flow is referred to as electricity.
- An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte
- Electric power, the rate at which electrical energy is transferred by a circuit
- Magnification, the factor by which an optical system enlarges an image
- Optical power, the degree to which a lens converges or diverges light
- Power (physics), the rate at which work is performed or energy is convert
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