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GENERAL 01
Basic Electricity
| Question | Answer |
|---|---|
| What is inductance? | Induced voltage which is opposite indirection to the applied voltage |
| What causes opposition to the flow of applied current in an A. C. circuit? | Inductive reactance and capacitance reactance |
| What represents capacitance in A.C. circuits? | A capacitor |
| What is the function of a capacitor? | Serves as a reservoir or storehouse for electricity |
| Why should nickel-cadmium batteries and lead-acid batteries not be stored or serviced in the same area? | The electrolyte in nickel-cadmium batteries is chemically opposite to the lead-acid battery electrolyte and the fumes from lead-acid batteries can contaminate the electrolyte in the nickel-cadmium batteries |
| What does an electrical circuit consist of? | A source of electrical pressure, resistance in the form of an energy-consuming device, and conductors in the form of wires to provide an electron flow |
| What is the most important law applicable to the study of electricity? | Ohms law |
| What are the elements of Ohms law? | Voltage, current, and resistance |
| What unit is used to measure power in D.C. circuits? | Watt |
| How many watts equal one kilowatt? | 1,000 |
| What are three types of D.C. electrical circuits? | Series, Parallel, and series-parallel |
| Define the term impedance. | The total opposition to the flow of current in an electrical circuit |
| How many cells make up a lead-acid battery rated at 24 volts? | 12 cells (2 volts each) |
| What should be the specific gravity of the electrolyte in a fully charged lead-acid battery? | Specific gravity between 1.275 and 1 .300 |
| What is the effect of temperature on specific gravity of the electrolyte when checking a lead-acid battery? | Battery temperature changes electrolyte density only when greater than 90°F or less than 70°F |
| Why is a specific gravity check of the electrolyte in a nickel-cadmium battery not acceptable to determine battery charge? | The electrolyte specific gravity does not change with the state of charge |
| How is Ohms law expressed as an equation? | I=E/R; or R=E/L; or E=1 × R |
| What is the most frequent cause of damage to solid-state components and integrated circuits? | Electro-static discharge (ESD) from the human body due to careless handling |
| What is magnetism? | The property of an object to attract certain metallic substances |
| What is the difference between permanent and temporary magnets? | When an external magnetizing force is removed, permanent magnets retain their magnetism/for an extended time whereas temporary magnets quickly lose most of their magnetism |
| What is the definition of a short circuit? | An unintentional low resistance path between a component/ conductor and ground |
| How would a technician connect a meter in a circuit to read its current? | Insert the meter in series by opening or breaking the circuit |
| What is the common name for the lines of force that make up a field surrounding a magnet? | Magnetic Flux or Flux Lines |
| What is the name of the concept that describes the relationship between electricity and magnetism? | Electromagnetism |
| Name at least two sources of electrical energy. | Thermal, light, pressure, chemical |
| What is the general purpose of a resistor? | To limit the amount of current flow |
| How may a small fixed resistor's value be easily determined? | By the color bands on the surface of the resistor |
| Name at least 2 types of resistors. | Fixed, variable, rheostat, potentiometer, thermistor |
| What is the standard unit of measure of frequency? | Hertz |
| Describe a basic capacitor. | Two parallel plates separated by a dielectric |
| What is the basic unit of the measure of capacitance? | Farad |
| What is the basic unit of the measure of inductance? | Henry |
| What component can change the electrical energy of a voltage to a different level of energy? | Transformer |
| When using a multi-meter what setting, or type of check, is typically used to determine an open in a conductor? | Continuity |
| When troubleshooting for open circuits with a multi-meter, a closed circuit, or a good wire, will be indicated with what reading? | A near zero reading |
| What instrument is used to measure the density of the electrolyte in a Lead Acid Battery? | Hydrometer |
| Name the two types of batteries commonly used in modern aircraft. | Lead Acid and Nickel Cadmium |
| In regards to batteries, what is an SLA battery? | Sealed Lead Acid Battery |
| What component can change a DC current into AC current? | Inverter |
| What component can transform Alternating Current into Direct Current? | A Rectifier |
| What is the basic component that allows current to flow in one direction only? | The diode |
| What does the acronym LED stand for? | Light Emitting Diode |
| What is one advantage of A.C. circuits over D.C. circuits in aircraft? | 1) A.C. can be transmitted over long distances more readily and more economically than D.C.;2) Space and weight can be saved; 3) Circuit breakers will operate satisfactorily at altitude; 4) A.C. devices are smaller and simpler; or 5) Most 24-volt aircraft |
| Describe a basic AND gate. | A standard logic symbol that has two inputs or more and one output, The two input signals must be received (true) in order for there to be an output signal transmitted |
| Describe a basic OR gate. | A standard logic symbol that has two inputs or more and one output Only one of the two input signals must be received (true) in order for there to be an output signal |
Created by:
Chisum
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