Conductive materials, such as metals, have a relatively low resistance.
![eletrical card five eletrical card five](https://filebroker-cdn.lazada.com.my/kf/S869740d55e1b443abb1b5e30104d9deae.jpg)
Circuit breakers are used in conjunction with protective relays to protect circuits from faults.Ĭonductor - Any material where electric current can flow freely. To restore service, the circuit breaker must be reset (closed) after correcting the cause of the overload or failure. Circuits can be in series, parallel, or in any combination of the two.Ĭircuit Breaker - An automatic device for stopping the flow of current in an electric circuit. Commonly used for filtering out voltage spikes.Ĭircuit - A closed path in which electrons from a voltage or current source flow. Measured in farads as the ratio of the electric charge of the object (Q, measured in coulombs) to the voltage across the object (V, measured in volts).Ĭapacitor - A device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
Eletrical card five generator#
The pivoted points in generator regulators are also called armatures.Ĭapacitance - The ability of a body to store an electrical charge. It is made up of conductors which rotate through a magnetic field to provide voltage or force by electromagnetic induction. Apparent power is the product of the rms voltage and the rms current.Īrmature - The movable part of a generator or motor. One ampere is equal to a current flow of one coulomb per second.Īpparent Power - Measured in volt-ampers (VA). For example, a battery which provides 5 amperes for 20 hours is said to deliver 100 ampere - hours.Īmpere (A) - A unit of measure for the intensity of an electric current flowing in a circuit.
![eletrical card five eletrical card five](https://ic.truckid.com/electronic-specialties/items/esi186_1.jpg)
It is obtained by multiplying the current (in amperes) by the time (in hours) during which current flows.
![eletrical card five eletrical card five](https://dcassetcdn.com/design_img/1026774/175838/175838_5610915_1026774_image.jpg)
Eletrical card five series#
Ammeters are always connected in series with the circuit to be tested.Īmpacity - The maximum amount of electric current a conductor or device can carry before sustaining immediate or progressive deterioration.Īmpere-Hour (Ah) - A unit of measure for battery capacity. Alternating Current (AC) - An electric current that reverses its direction many times a second at regular intervals.Īmmeter - An instrument for measuring the flow of electrical current in amperes.