Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What is the basic unit of voltage?
|
The Volt.
|
|
|
What is the basic unit of current?
|
The Amp.
|
|
|
What is the basic unit of resistance?
|
The ohm.
|
|
|
Which law of electricity is the most important for an aircraft mechanic to know?
|
Ohm's law.
|
|
|
What are the three elements in Ohm's law?
|
Voltage, current, and resistance (volts, amps, and ohms).
|
|
|
What are five sources of electrical energy?
|
Magnetism, chemical energy, light, heat and pressure.
|
|
|
What four things affect the resistance of an electrical conductor?
|
The material, the cross-sectional area, the length and the temperature.
|
|
|
How can you tell the resistance of a composition resistor?
|
By a series of colored bands around one end of the resistor.
|
|
|
What three things must all electrical circuits contain?
|
A source of electrical energy, a load to use the energy, and conductors the join the source and the load.
|
|
|
What is the purpose of a capacitor?
|
To store electrical energy in electrostatic fields.
|
|
|
What is the basic unit of capacitance?
|
The farad.
|
|
|
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.
|
|
|
What is meant by inductance?
|
The ability to store electrical energy in electromagnetic fields.
|
|
|
What is the basic unit of inductance?
|
The henry.
|
|
|
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.
|
|
|
How can you find the polarity of an electromagnet?
|
Left hand rule.
|
|
|
In what units is impedance measured?
|
In ohms.
|
|
|
What is the basic unit of electrical power in a DC circuit?
|
The watt.
|
|
|
What is meant by a kilowatt?
|
1,000 watts.
|
|
|
What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
|
The current increases.
|
|
|
What are three types of DC circuits, with regard to the placement of various circuit components?
|
Series, parallel and series-parallel.
|
|
|
How many cells are there in a 24-volt lead-acid battery?
|
12.
|
|
|
What is the specific gravity of the electrolyte in a fully charged lead-acid battery?
|
Between 1.275 and 1.300.
|
|
|
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 instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?
|
A hydrometer.
|
|
|
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 is used to neutralize spilled electrolyte from a lead-acid battery?
|
A solution of bicarbonate of soda and water.
|
|
|
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 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.
|
