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29 Cards in this Set
- Front
- Back
What is the basic unit of voltage?
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The Volt.
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What is the basic unit of current?
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The Amp.
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What is the basic unit of resistance?
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The ohm.
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Which law of electricity is the most important for an aircraft mechanic to know?
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Ohm's law.
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What are the three elements in Ohm's law?
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Voltage, current, and resistance (volts, amps, and ohms).
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What are five sources of electrical energy?
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Magnetism, chemical energy, light, heat and pressure.
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What four things affect the resistance of an electrical conductor?
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The material, the cross-sectional area, the length and the temperature.
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How can you tell the resistance of a composition resistor?
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By a series of colored bands around one end of the resistor.
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What three things must all electrical circuits contain?
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A source of electrical energy, a load to use the energy, and conductors the join the source and the load.
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What is the purpose of a capacitor?
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To store electrical energy in electrostatic fields.
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What is the basic unit of capacitance?
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The farad.
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Why should electrolytic capacitors not be used in an AC circuit?
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They are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity.
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What is meant by inductance?
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The ability to store electrical energy in electromagnetic fields.
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What is the basic unit of inductance?
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The henry.
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What is meant by impedance?
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The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance and inductive reactance.
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How can you find the polarity of an electromagnet?
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Left hand rule.
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In what units is impedance measured?
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In ohms.
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What is the basic unit of electrical power in a DC circuit?
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The watt.
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What is meant by a kilowatt?
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1,000 watts.
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What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
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The current increases.
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What are three types of DC circuits, with regard to the placement of various circuit components?
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Series, parallel and series-parallel.
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How many cells are there in a 24-volt lead-acid battery?
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12.
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What is the specific gravity of the electrolyte in a fully charged lead-acid battery?
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Between 1.275 and 1.300.
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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?
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Between 70 degrees and 90 degrees Fahrenheit.
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What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?
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A hydrometer.
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How is a lead-acid battery compartment treated to protect it from corrosion?
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Paint it with an asphaltic (tar base) paint or with polyurethane enamel.
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What is used to neutralize spilled electrolyte from a lead-acid battery?
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A solution of bicarbonate of soda and water.
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How high should the electrolyte level be in a properly serviced lead-acid battery?
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Only up to the level of the indicator in the cell.
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What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries are serviced?
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The two types of batteries should be kept separate and the tools used on one type should not be used on the other.
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