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A And P general oral > Basic Electronics > Flashcards

Basic Electronics Flashcards

1
Q

What is the most important law applicable to study of electricity

A

Ohms law E =I X R

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2
Q

What are the elements of ohms law

A

Voltage E, current I, resistance R

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3
Q

What are the 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 (battery) ,a resistance or load (lightbulb) conductors (wires)

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5
Q

What represents capacitance in an AC circuit

A

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

A diode

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10
Q

What is inductance

A

When voltage is Inducted by magnetic Flux lines in a coil in an AC circuit. The inducted voltage is opposed in direction to the applied voltage and opposes any change in the alternating current

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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 impendance

A

The total Opposition for AC to flow caused by a combined affect of resistance inductive resistance and capacitive reactance in an AC circuit

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13
Q

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

A

Inductive, and capacitance reactants

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14
Q

What is the unit of measure for impedance

A

Ohms

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15
Q

What is the general purpose of a resistor

A

To limit current

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16
Q

How May the value of small, fixed resistor be determined

A

By the color band on the resistor

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17
Q

What are the two things that happen when current flows through conductor

A

A magnetic field is generated and a conductor heat up

18
Q

What is the common name for the lines of force that make up the field surrounding the magnet

A

Magnetic flux lines

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 in electrical current

A

The wire gauge length temperature and material

21
Q

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

A

The watt. Amperes Times voltage equals watch P= I x E. 746 whats equal 1 Horse power

22
Q

What is a kilowatt

A

1000 W

23
Q

In a DC circuit, what occurs when voltage is increased while the resistant remains constant

A

Increase in current

24
Q

What are the three types of DC electrical currents

A

Siri circuit, parallel circuit, complex circuit

25
Q

A 24 V lead acid battery has how many cells

A

It has 12 cells and each sale is rated at approximately 2 V

26
Q

What are the units that the battery capacity is measured in

A

Ampere-hours

27
Q

What should be the specific gravity of the electrolyte in a fully charged lead acid battery

A

It should be between 1.275 and 1.300

28
Q

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

A

A hydrometer

29
Q

Why can’t a hydrometer not be used to determine the charge of a nickel cadmium battery

A

The electrolytes in a nickel cadmium battery does not change appreciable during charge or discharge of the battery

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

Adjustments must be made if the temperature of the electrolyte is above 90 or below 70°F

31
Q

What is electromagnetic Induction

A

Transfer of electrical energy by means of a magnetic field. Transferring voltage from one conductor to another without physically touching

32
Q

How are battery compartment protected against corrosion

A

Coded with a special corrosion resistant paint such as bituminous paint

33
Q

What should be the correct electrolyte levels in a properly service battery

A

3/8 inches above the plates

34
Q

What are paralleling generators and how is the load distributed

A

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

35
Q

Describe a non-tripped circuit breaker

A

A trip free breaker makes it impossible to hold the circuit closed if it pops with the circuit gets hot you cannot be reset until it gets cold

36
Q

Can you store a NiCad or lead acid battery together

A

No the fumes can contaminate the electrolyte in the NiCad battery from the lead acid battery

37
Q

What is the result of an in balance to sell in a nickel cadmium battery

A

When his cell has low internal resistance, current will increase across the cell, causing the heat up

38
Q

What happens to specific gravity of an electrolyte in a lead acid battery when the temperature changes

A

Reading on the hydrometer will vary with temperature variations

For example as the temperature of the electrolyte increases, the specific gravity reading will be high, and cold or electrolytes will have a lower apparent reading

39
Q

What is an L.E.D.

A

Light emitting diode

40
Q

What is a S.L.A.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 D.C.alternator

A

Reverse current cut out

A And P general oral (12 decks)

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