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General > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

What is the basic unit of voltage?

A

The Volt

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2
Q

What is the basic unit of current?

A

The Amp

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3
Q

What is the basic unit of resistance?

A

The ohm

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4
Q

Which law of electricity is the most important for a aircraft mechanic to know

A

Ohms law

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5
Q

What are three elements in ohms law?

A

Voltage, current, and resistance (volts, Amps, and ohms)

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6
Q

What are five sources of electrical energy

A

Magnetism, chemical energy, light, heat and pressure

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7
Q

What four things affect the resistance of an electrical conductor?

A

The material, the cross-sectional area, the length and the temperature

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8
Q

How can you tell the resistance of composition resistor?

A

By a series of colored bands around one end of the resistor

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9
Q

What three things must all electrical circuits contain

A

A source of electrical energy, a load to use the energy, and conductors to join the source and the load

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10
Q

What is the purpose of a capacitor?

A

To store electrical energy in electrostatic fields

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11
Q

What is the basic unit of capacitance?

A

The farad

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12
Q

Why should electrolytic capacitors not be used in an AC circuit?

A

They are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity.

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13
Q

What is meant by inductance?

A

The ability to store electrical energy in electromagnetic fields.

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14
Q

What is the basic unit of inductance?

A

The Henry

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15
Q

What is meant by impedance?

A

The total of opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance and inductive reactance

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16
Q

How can you find the polarity of an electromagnet?

A

Hold the 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

17
Q

In what units is impedance measured?

A

In ohms

18
Q

What is the basic unit of electrical power in a DC circuit?

A

The watt

19
Q

What is meant by a kilowatt?

A

1,000 watts

20
Q

What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?

A

The current increases

21
Q

What are three types of DC circuits , with regard to the placement of the various circuit components?

A

Series, parallel, and series-parallel

22
Q

How many cells are in a 24-volt lead-acid battery?

A

12

23
Q

What are the specific gravity of the electrolyte in a fully charged lead-acid battery?

A

Between 1.275 and 1.300

24
Q

What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply you apply a correction when measuring it’s specific gravity?

A

Between 70 degrees and 90 degrees Fahrenheit.

25
Q

What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?

A

A hydrometer

26
Q

How is the lead-acid battery compartment treated to protect it from corrosion?

A

Paint it with asphaltic (tar based) paint or with poly-urethane enamel

27
Q

What is used to neutralize spilled electrolyte from a lead-acid battery?

A

A solution of bicarbonate of soda and water

28
Q

How high should the electrolyte level be in a properly serviced lead-acid battery?

A

Only up to the level of the indicator in the cell

29
Q

What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries are serviced?

A

The two types of batteries should be kept separate, and the tools used on one type should not be used on the other

30
Q

Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?

A

The electrolyte of a nickel-cadmium battery does not enter into the chemical changes that occur when the battery is charged or discharged . It’s specific gravity does not change appreciably

31
Q

What is used to neutralize spilled electrolyte from a nickel-cadmium battery?

A

A solution of boric acid and water

32
Q

What is meant by electromagnetic induction?

A

The transfer of electrical energy from one conductor to another that is not electrically connected

33
Q

How many ohms are in a megohm?

A

One million (1,000,000)

34
Q

What part of an amp is a milliamp?

A

One thousandth (0.001)

General (3 decks)

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