Alternating Current (AC) — An electric current that reverses its direction many times a second at regular intervals.The importance of learning automotive electrical The purpose of. Apply fundamental automotive engineering knowledge to. Use tools and equipment to complete basic workshop engineering tasks. New Zealand Certificate in Automotive Electrical Engineering (Level 4) Learning outcomes include: Follow workplace policies, procedures and relevant regulations to work safely and effectively in an automotive workshop.
Automotive Electrical Theory Series With The
Step 1: plae hoa swith to off, check incoming voltage for control alarm circuit step 2: check fuses and circuit breakers step 3: place hoa switch to hand step 4: check voltage at motor contactor coil step 1 step 2 step 4 step 3Ampacity — The maximum amount of electric current a conductor or device can carry before sustaining immediate or progressive deterioration.N2 Motor Electrical Trade Theory (Electronic) Publisher: Hybrid Learning Solutions. Pump does run when contactor is pushed in manually. 'Electrical engineering, the theory and characteristics of electrical circuits and machinery' - OZON auto, contactor does not pull in. Ammeters are always connected in series with the circuit to be tested. In cars, the metal chassis is the ground (that's why the battery's negative lead is bolted to the engine or frame) and the power source is the positive lead on the battery.Ammeter — An instrument for measuring the flow of electrical current in amperes. That is, electrons must flow from the power source through the device to a ground.
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.Circuit Breaker — An automatic device for stopping the flow of current in an electric circuit. Commonly used for filtering out voltage spikes.Circuit — 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).Capacitor — A device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator. The pivoted points in generator regulators are also called armatures.Capacitance — The ability of a body to store an electrical charge.
Spontaneous corona discharges occur naturally in high-voltage systems unless care is taken to limit the electric field strength.Current (I) — The flow of an electric charge through a conductor. Copper and aluminum wire are the most common conductors.Corona — A corona discharge is an electrical discharge brought on by the ionization of a fluid such as air surrounding a conductor that is electrically charged. Conductive materials, such as metals, have a relatively low resistance.
The sulfuric acid - water solution in a storage battery is an electrolyte.Electromotive Force — (EMF) A difference in potential that tends to give rise to an electric current. Diodes allow current to flow when the anode is positive in relation to the cathode.Direct Current (DC) — An electric current that flows in only one direction.Electrolyte — Any substance which, in solution, is dissociated into ions and is thus made capable of conducting an electrical current. See Frequency.Demand — The average value of power or related quantity over a specified period of time.Dielectric constant — A quantity measuring the ability of a substance to store electrical energy in an electric field.Dielectric strength — The maximum electric field that a pure material can withstand under ideal conditions without breaking down (i.e., without experiencing failure of its insulating properties).Diode — A semiconductor device with two terminals, typically allowing the flow of current in one direction only. Measured in amperes.Cycle — The change in an alternating electrical sine wave from zero to a positive peak to zero to a negative peak and back to zero.
One farad is equal to one coulomb per volt.Ferroresonance — (nonlinear resonance) a type of resonance in electric circuits which occurs when a circuit containing a nonlinear inductance is fed from a source that has series capacitance, and the circuit is subjected to a disturbance such as opening of a switch. It is also used as one theory to explain direction of current flow in a circuit.Farad — A unit of measure for capacitance. It has a negative charge of electricity.Electron theory — The theory which explains the nature of electricity and the exchange of "free" electrons between atoms of a conductor.
A load rejection test confirms that the system can withstand a sudden loss of load and return to normal operating conditions using its governor. Electrical energy is sold in units of kWh.Kilowatt-hour Meter — A device used to measure electrical energy use.Load — Anything which consumes electrical energy, such as lights, transformers, heaters and electric motors.Load Rejection — The condition in which there is a sudden load loss in the system which causes the generating equipment to be over-frequency. For example, if a 100W light bulb is used for 4 hours, 0.4kWhs of energy will be used (100W x 1kW / 1000 Watts x 4 hours). Insulators protect equipment and life from electric shock.Inverter — An apparatus that converts direct current into alternating current.Kilowatt-hour (kWh) — The product of power in kW and time in hours. Insulative materials, such as glass, rubber, air, and many plastics have a relatively high resistance. The inductance is directly proportional to the number of turns in the coil.Insulator — Any material where electric current does not flow freely.
The difference between the two is caused by reactance in the circuit and represents power that does no useful work.Protective Relay — A relay device designed to trip a circuit breaker when a fault is detected.Reactive Power — The portion of electricity that establishes and sustains the electric and magnetic fields of AC equipment. Values of current and voltage. Measured in Watts.Power Factor — The ratio of the actual electrical power dissipated by an AC circuit to the product of the r.m.s. Each load connected in a separate path receives the full circuit voltage, and the total circuit current is equal to the sum of the individual branch currents.Piezoelectricity — Electric polarization in a substance (especially certain crystals) resulting from the application of mechanical stress (pressure).Polarity — A collective term applied to the positive (+) and negative ( - ) ends of a magnet or electrical mechanism such as a coil or battery.Power — The rate at which electrical energy is transferred by an electric circuit. It is analogous to a closed valve in a water system.Parallel Circuit — A circuit in which there are multiple paths for electricity to flow. One ohm is equivilant to the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt.Ohm's Law — The mathematical equation that explains the relationship between current, voltage, and resistance (V=IR).Ohmmeter — An instrument for measuring the resistance in ohms of an electrical circuit.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.
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