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General Oral Study Guide > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

What is the most important law applicable to the study of electricity?

A

Ohm’s Law E= I x R

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2
Q

What are the elements of ohms law?

A

Voltage, current, resistance

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3
Q

what are four sources of electrical energy?

A

Thermal, light, pressure and chemical

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4
Q

what does an electrical circuit consist of?

A

A source, resistance or load, and conductors

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5
Q

what represents capacitance in an AC circuit?

A

Capacitor

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6
Q

what is the function of a capacitor?

A

to store electricity

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7
Q

what is the unit of measure for capacitance?

A

Farad

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8
Q

what is the standard unit of measure for frequency?

A

Hertz

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9
Q

what is the basic component that only allows current to flow in one direction?

A

Diode (acts like a check valve)

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10
Q

What is inductance?

A

opposition to the flow of current in an AC circuit offered by a coil

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11
Q

What is an example of an inductor in a magneto?

A

the Coil

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12
Q

what is impedance?

A

The total resistance in a circuit

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13
Q

what causes opposition to the flow of current in an AC circuit?

A

Inductive, and capacitive reactance

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14
Q

What is the unit of measurement for impedance?

A

Ohms

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15
Q

what is a general purpose of a resistor?

A

to limit current

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16
Q

how may the value of a small, fixed resistor be determined?

A

By the color bands of the resistor

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17
Q

what are the two things that happen when current flows through a conductor?

A

Magnetic field is generated and the conductor heats up

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18
Q

what is the common name for the lines of force that make up a field surrounding a magnet?

A

Magnetic flux lines

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19
Q

what is the concept that describes the relationship between electricity and magnetism?

A

Electromagnetism

20
Q

what are the four factors that affect the resistance of an electrical conductor?

A

Wire gauge, length, temperature, and material

21
Q

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

A

the Watt. P = I x E

22
Q

What is a kilowatt?

A

1,000 Watts Kilo means thousand

23
Q

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

A

There will be an increase in current.

24
Q

What are the three types of DC electrical circuits?

A

Series, compound, parallel

25
Q

A 24-Volt lead acid battery has how many cells ?

A

12 cells each is approx. 2 volts

26
Q

what are the units that a battery capacity is measured in?

A

Ampere-hours

27
Q

what should be the specific gravity of the electrolyte in a fully charge lead acid battery?

A

Should be between 1.275 and 1.300

28
Q

what instrument is used to determine specific gravity of electrolyte in lead acid battery?

A

Hydrometer

29
Q

why can a hydrometer not be used to determine the charge of NiCad battery?

A

The specific gravity of the electrolyte and NiCad battery does not change appreciatively during charge or discharge.

30
Q

When using a hydrometer to check the charge of a lead acid battery, at what temperature must a correction factor be applied to the reading?

A

above 90°F and below 70°F adjustments must be made

31
Q

what is electromagnetic induction?

A

The transfer of electrical energy by means of magnetic field. Transferring voltage from one conductor to another without physical touching.

32
Q

How are battery compartments protected against corrosion?

A

They are coated with special corrosion resistant paint such as bituminous paint.

33
Q

What should be the correct electrolyte level in a properly serviced battery?

A

It should be approximately 3/8 of an inch above the plates. If battery has baffle plates above cell plates, the electrolyte levels should be up to the hole in the baffle plate in each cell.

34
Q

What are paralleling generators and how is the load distributed?

A

When two or more generators are operated at the same time to supply power for a load that must be shared equally.

35
Q

Describe a trip free circuit breaker?

A

Is impossible to manually hold circa close when excessive current is flowing

36
Q

can you store NiCad and lead acid batteries together?

A

no because cross contamination can occur

37
Q

what is the result of an imbalance cell in a NiCad battery?

A

Current will increase across the cell causing it to heat up

38
Q

what happens to the specific gravity of electrolyte and lead acid battery when the temperature changes?

A

it follows temperature

high temp = higher specific gravity reading
low temp = lower specific gravity reading

39
Q

What is an LED?

A

Light Emitting Diode

40
Q

What is an SLA battery?

A

Sealed Lead Acid Battery

41
Q

What is the basic unit of measure for inductance?

A

Henry

42
Q

What prevents reverse current flow in a DC alternator?

A

Reverse current cutout

43
Q

How many wires may be installed in a single terminal lug?

A

4

44
Q

how do you identify wire types?

A

Lettering on the insulation

45
Q

what is the max number of terminals I can be attached to a terminal strip stud?

A

More than four terminal lugs or three terminal lugs and a bus bar

General Oral Study Guide (4 decks)

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