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23 Cards in this Set
- Front
- Back
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What is the basic unit of voltage? |
The volt |
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What is the basic unit of current? |
The amp |
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What is the basic unit of resistance? |
The ohm |
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Which law of electricity is the most important for an aircraft mechanic to know? |
Ohm's law. |
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What are 3 elements in ohm's law? |
Voltage, current, and resistance. (Volts, amps, ohms) |
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What are 5 sources of electrical energy? |
Magnetism, chemical energy, light, heat and pressure. |
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What 4 things affect the resistance of a composition resistor? |
By a series of colored bands around one end of the resistor. |
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What 3 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. |
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What is the purpose of a capacitor? |
To store electrical energy in electrostatic fields. |
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What is the basic unit of capacitance? |
The farad. |
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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. |
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What is meant by inductance? |
The ability to store electrical energy in electromagnetic fields. |
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What is the basic unit of inductance? |
The henry. |
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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. |
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How can you find the polarity of an electromagnet? |
Hold the electromagnet in your left hand wig your fingers encircling the coil in the direction the electrons flow. Your thump will point to the north end of the electromagnet. |
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In what units is impedance measured? |
In ohm's. |
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What is the basic unit of electrical power in a DC circuit? |
The watt. |
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What is meant by kilowatt? |
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? |
The current increases. |
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What are 3 types of DC circuits, with regards to the placement of the various circuit components? |
Series, parallel and series-parallel. |
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How many cells are there in a 24-volt lead-acid battery? |
12 |
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What is the specific gravity of an electrolyte in a fully charged lead-acid battery? |
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? |
Between 70°F and 90°F. |
