An Arc Fault Circuit Interrupter (AFCI) is a circuit breaker that breaks the circuit when it detects an electric arc in the circuit it protects and shuts off the power so to prevent electrical fires.
Ampere or Amp
Ampere or amp (symbol: A) is the unit of electrical current. The current is defined as the amount of charge that flows past a give point, per unit of time. The symbol I is used for current in equations and A is the abbreviation for ampere.
Capacitor: Is a passive electronic component that consists of two conductive plates separated by an insulating dielectric. A voltage applied to the plates develops an electric field across the dielectric and causes the plates to accumulate a charge. When the voltage source is removed, the field and the charge remain until discharged, storing energy.
Current: Movement of electricity along a conductor. Current is measured in amperes.
Diode: An electrical device that will allow current to pass through itself in one direction only.
Direct Current ( DC )
Direct Current (DC): A steady flow of electrons moving steadily and continually in the same direction along a conductor from a point of high potential to one of lower potential. It is produced by a battery, generator, or rectifier.
Generator: A device which converts mechanical energy into electrical energy.
A ground fault circuit interrupter (GFCI) is a device that shuts off power to the circuit when it detects that current is flowing along an unintended path, such as through water or a person.
Ground: A ground occurs when any part of a wiring circuit unintentionally touches a metallic part of the machine frame.
Inductance: The property of an electric circuit by which an electromotive force (voltage) is induced in it by a variation of current either in the circuit itself or in a neighboring circuit.
Inductor: A coil of wire wrapped around an iron core.
Insulator: A substance or body that resists the flow of electrical current through it. Also see “Conductor:’
Ohm: The standard unit for measuring resistance to flow of an electrical current. Every electrical
conductor offers resistance to the flow of current, just as a tube through which water flows offers resistance to the current of water. One ohm is the amount of resistance that limits current flow to one ampere in a circuit with one volt of electrical pressure.
Open Circuit: An open or open circuit occurs when a circuit is broken, such as by a broken wire or open switch, interrupting the flow of current through the circuit. It is analogous to a closed valve in a water system.
Parallel Circuit: A circuit in which the circuit components are arranged in branches so that there is a separate path to each unit along which electrical current can flow.
Potentiometer: A variable resistor used as a voltage divider.
Resistor: A device usually made of wire or carbon which presents a resistance to current flow.
Series-Parallel Circuit: A circuit in which some of the circuit components are connected in series and others are connected in parallel.
Switch: A device which opens or closes electrical pathways in an electrical circuit.
Transformer: Is a device made of two coil windings that transfers voltage from one coil to the next through electromagnetic induction. Depending upon the number of windings per coil, a transformer can be designed to step – up or step – down its output voltage from its input voltage. Transformers can only function with alternating current (AC).
Volt: A unit of electrical pressure (or electromotive force) which causes current to flow in a circuit. One volt is the amount of pressure required to cause one ampere of current to flow against one ohm of resistance.
Voltage: Force which is generated to cause current to flow in an electrical circuit. It is also referred to as electromotive force or electrical potential. Voltage is measured in volts.
Watt: A unit of measure for indicating the electrical power applied in a circuit. It is obtained by multiplying the current (in amperes) by the electrical pressure (in volts) which cause it to flow. That is: watts = amperes x volts.
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