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GENERAL -

FUNDAMENTALS OF ELECTRICITY

QuestionAnswer
What part of an amp is a milliamp? One thousandth (0.001).
What happens to the current in a DC circuit if the voltage is increased but the resistance stays the same? The current increases.
What are three types of DC circuits, with regards to the placement of the various circuit components? Series, Parallel, and Series-Parallel.
What is meant by a kilowatt? 1,000 watts.
How many cells are there in a 24 volt lead-acid battery? 12.
What is the basic unit of electrical power in a DC circuit? The watt.
What is the specific gravity of the electrolyte in a fully charged lead-acid battery? Between 1.275 and 1.300
In what unit is impedance measured? In ohms.
What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply a correction when measuring its specific gravity? Between 70 degrees and 90 degrees Fahrenheit.
What is meant by electromagnetic induction? The transfer of electrical energy from one conductor to another that is not electrically connected.
What is the basic unit of capacitance? The farad.
What three things must all electrical circuits contain? A source of electrical energy, a load to use the energy, and conductors to join the source and the load.
What are five sources of electrical energy? Magnetism, chemical energy, light, heat, and pressure.
How can you find the polarity of an electromagnet? Hold the electromagnet in your left hand with your fingers encircling the coil in the direction the electrons flow. Your thumb will point to the north end of the electromagnet.
How high should the electrolyte level be in a properly serviced lead-acid battery? Only up to the level of the indicator in the cell.
What is used to neutralize spilled electrolyte from a lead-acid battery? A solution of bicarbonate soda and water.
What are the three elements in Ohm's Law? Voltage, current, and resistance (volts, amps, and ohms).
Why is a hydrometer not used to measure the charge of a nickel-cadmium battery? The electrolyte of a nickel-cadmium battery does not enter into the chemical changes that occur when the battery is charged or discharged. Its specific gravity does not change appreciably.
What is meant by impedance? The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance, and inductive reactance.
What instrument is used to measure the specific gravity of the electrolyte in a lead acid battery? A hydrometer.
What is the basic unit of current? The amp.
How many ohms are in a megohm? One million (1,000,000).
How can you tell the resistance of a composition resistor? By a series of colored bands around one end of the resistor.
What is the basic unit of voltage? The volt.
What is the purpose of a capacitor? To store electrical energy in electrostatic fields.
How is a lead-acid battery compartment treated to protect it from corrosion? Paint it with an asphaltic (tar base) paint or with polyurethane enamel.
What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries are serviced? The two types of batteries should be kept separate, and the tools used on one type should not be used on the other.
What is the basic unit of resistance? The ohm.
Why should electrolytic capacitors not be used in an AC circuit? They are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity.
Which law of electricity is the most important for an aircraft mechanic to know? Ohm's Law.
What is used to neutralize spilled electrolyte from a nickel-cadmium battery? A solution of boric acid and water.
What is meant by inductance? The henry.
What four things affect the resistance of an electrical conductor? The material, the cross-sectional area, the length, and the temperature.
Created by: bdomn
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