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A & P Orals - General > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

1 kW is equal to how many watts?

A

1000 watts

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2
Q

What is a common cause of damage to solid-state components and/or integrated circuits?

A

Electrostatic discharge from the human body during handling

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3
Q

Describe magnetism

A

An object properties which attract metallic substances

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4
Q

When the external magnetizing force is removed, what is the difference between permanent/temporary magnets?

A

Permanent magnets retain their magnetism, and temporary magnets rapidly lose their magnetism

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5
Q

What makes up an electrical circuit?

A

Source of electrical energy, a resistance, and a conductor

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6
Q

What law governs the basic study of electricity?

A

Ohms law

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7
Q

What are the basic elements of ohms law?

A

E Dash voltage, R Dash resistance, I – current

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8
Q

Which change occurs in a DC circuit when applied voltage is increased and resistance remains constant?

A

Current increases

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9
Q

Ohms law expressed as an equation

A

E= IxR, R= E/I, I= E/R

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10
Q

Scientifically, power is measured in

A

Watts

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11
Q

Common methods electrical energy can be produced

A

Pressure, chemical, thermal, sunlight

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12
Q

The law relevant to voltage law

A

Kirchhoff’s law

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13
Q

Three types of DC electrical circuits

A

Series, parallel, and series/parallel (complex)

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14
Q

Types of circuits aircraft mechanics encounter on aircraft?

A

A combination circuit, series-parallel

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15
Q

Compare AC & DC circuits in aircraft

A

DC flows constantly in one direction. AC has ability to change direction at or during regular intervals, is lighter weight, and its voltage can be stepped up and down by using a transformer.

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16
Q

How much voltage do most aircraft systems require for special equipment?

A

Most need 24 V, needs 400 Hz AC current

17
Q

You must apply a correction to the specific gravity that varies between what two values?

A

When the temperature is less than 70°F or more than 90°F

18
Q

The functions of a capacitor in an AC circuit

A

The store electricity

19
Q

How is capacitance represented in an AC circuit

A

Buy a capacitor

20
Q

How is inductance represented in an AC circuit

A

By a coil

21
Q

Describe inductance

A

Inducted voltage - which is opposite in direction to the applied voltage

22
Q

What properties of an AC circuit oppose any change in current?

A

Resistance, inductive reactance, and capacitive reactance

23
Q

Describe impedance in an AC circuit?

A

The components delay or slow down the AC current or voltage due to their internal resistance

24
Q

What is the common use of most multimeters?

A

Troubleshooting and measurement of voltage, resistance, current continuity, capacitance, and inductance

25
Q

Describe short circuit

A

Low resistance path between two poles

26
Q

Using a multimeter, how would a technician read current?

A

Inserting the ammeter or multimeter in series by opening or breaking the circuit. The positive side of the meter read is connected towards a positive voltage source and negative Jack to the black.

27
Q

Why would you not perform a specific gravity check of electrolyte NI-CAD battery?

A

Because the specific gravity does not change with the state of charge

28
Q

How many cells make up a lead acid battery rated at 24 Volts?

A

12 cells

29
Q

When reading a specific gravity of a fully charged lead acid battery, what indicates the high state of charge?

A

Specific of gravity of the battery liquid between 1.275 and 1.310

30
Q

What is considered to be the open circuit voltage of a fully charged 12 cell lead acid battery?

A

Approximately 26.4 Volts or 12×2.2 Volts which equals 28 Volts are required for charging.

31
Q

What is the open circuit cell voltage of a NiCad battery?

A

1.25 Volts

32
Q

What is a hazard when storing NiCad batteries and lead acid batteries in the same area?

A

The fumes from one type can contaminate the electrolyte and the other type

33
Q

Can NiCad batteries be interchangeable with lead acid types?

A

Yes

34
Q

How does a capacitor store electricity?

A

In the form of a electrostatic charge or field that exists between two conductors separated by an insulator

35
Q

What should be done when interchanging a NiCad battery with a lead battery?

A

Clean, dry and neutralize with boric acid or ammonia, then completely air/oven dried

36
Q

What is a probable cause when troubleshooting the NiCad battery for failing to deliver it’s rated capacity?

A

Faulty cells or cell imbalance

A & P Orals - General (12 decks)

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