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A&P Oral > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

What law describes the most fundamental or basic relationship in an electrical circuit?

A

Ohm’s law

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2
Q

What are three elements of Ohm’s law?

A

Voltage, current, resistance

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3
Q

How would you write Ohm’s law as an equation?

A

E= I x R

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4
Q

A 24 volt lead acid battery has how many cells?

A

12 cells at 2 volts a piece

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5
Q

In DC circuit, what unit measures power?

A

Watts

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6
Q

If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount of current flowing in the aircraft?

A

It also doubles

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7
Q

What three elements are required to form an electrical circuit?

A

A source, load, and conductor

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8
Q

What are the 3 DC electrical circuits

A

Series, parallel and series parallel

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9
Q

A fully charged lead acid battery has a specific gravity that varies between what two values?

A

1.275 and 1.3

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10
Q

You must apply a corrosion to the specific gravity reading of electrolyte of a lead-acid battery when the temperature is outside of what two values?

A

When temperature is less than 70 degrees Fahrenheit and more than 90 degrees Fahrenheit

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11
Q

What is the reason for have separate facilities for storing and servicing nick-cadmium and lead-acid batteries?

A

The electrolytes in the two types of batteries is opposite and the fumes from one type can contaminate the electrolyte of the other type.

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12
Q

The state of charge of a ni-cad battery cannot be determined by using a hydrometer to measure specific gravity of the electrolyte for what reason?

A

The specific gravity in a Ni-cad battery does not change that much

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13
Q

What principle advantage of AC current over DC current?

A

Power can be transmitted over long distance more efficiently and with smaller wires because the voltage can be easily increased on decreased by the transformer.

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14
Q

What are the three causes of opposition to current flow in an AC circuit?

A

Resistance, inductive reactance and capacitive reactance.

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15
Q

Define inductance.

A

It is voltage induced in a coil that opposes change in current

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16
Q

What component creates capacitance in AC circuits?

A

A capacitor

17
Q

How does a capacitor store electricity?

A

stored in a electrostatic field

18
Q

What property of an AC circuit is defined by the term “impedance”?

A

The total opposition to the current flow.

19
Q

What are two reasons that might cause a nickel-cadmium battery to fail to deliver its rated capacity?

A

Faulty cells or cell imbalance

20
Q

What electrical values are measured by typical multimeter?

A

Voltage, current , resistance

21
Q

One kilowatt is equal to how many watts?

A

1,000 watts

22
Q

What is the function of a capacitor

A

To store electrical energy

23
Q

What are four sources of electrical power

A

Mechanical, magnetism, pressure, chemical, photoelectric and thermal

24
Q

What is the unit of measurement of power in a DC circuit

A

P= I x E

25
Q

In DC circuit what occurs when voltage is increased while resistance remains constant?

A

Current increases

26
Q

What instrument is used to determine the specific gravity of electrolytes in a lead acid battery

A

Hydrometer

27
Q

What is the relationship between mechanical and electrical power

A

1 horsepower = 746 watts

28
Q

What is voltage

A

Electrical pressure

29
Q

To measure voltage is the voltmeter placed in series or parallel with the source

A

Parallel

30
Q

What is electrical current

A

Flow of electrons in a circuit

31
Q

To measure current through a component is an ammeter placed in parallel or in series with the component

A

In series

32
Q

What is used to measure electrical resistance and continuity

A

Ohmmeter

33
Q

What is impedance

A

The sum of resistance, capacitive reactance and inductive reactance

34
Q

What is electromagnetic induction

A

It is a transfer of electricity by a magnetic field

35
Q

What should be the appropriate electrolyte level in a properly serviced battery

A

Only up to the level of the indicator in the cell

A&P Oral (11 decks)

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