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General > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

One kilowatt is equal to how many watts?

A

1,000 watts

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2
Q

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

A

Ohms law 

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3
Q

What are the three elements of ohms law?

A

Voltage current and resistance

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4
Q

How would you write ohms law as an equation?

A

E = I x R

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5
Q

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

A

It also doubles

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6
Q

In DC circuits what unit measures power?

A

Watts

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7
Q

What three elements are required to form an electrical circuit

A

A source of electrical energy, a load or resistance to use electrical energy and wires or conductors to connect the source to the load

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8
Q

What is the definition of a short circuit?

A

An unintentional low resistance path between a component/conductor to ground

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9
Q

DC circuit can take on of three forms or types. What are they?

A

Series, parallel, and series/parallel or complex

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10
Q

Name the sources of electrical energy

A

Thermal, light, pressure, magnetism, and chemical

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11
Q

Describe a capacitor

A

Two parallel plates, separated by dielectric

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12
Q

Fully charge lead acid battery has a specific gravity that varies between what two values

A

1.275 and 1.300

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13
Q

A 24 V lead acid battery has how many cells

A

12

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14
Q

What tool is used to measure the density of the electrolyte in the lead acid battery?

A

Hydrometer

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15
Q

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

A

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

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16
Q

What is the reason for having separate facilities for storing and servicing nickel cadmium and lead acid batteries?

A

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

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17
Q

The charge of a nickel cadmium battery cannot be determined by measuring the specific gravity of electrolyte, for what reason

A

There is no significant change in the specific gravity of the electrolyte, as the battery is charged or discharged

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18
Q

What is the principal advantage of AC current over DC current

A

Power can be transmitted over long distances, more efficiently, and with smaller wires, because the voltage can be easily increase or decrease by transformer

19
Q

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

A

Resistance, inductive reactance, and capacitive reactance

20
Q

Define inductance

A

An induced voltage, which is opposite in direction to the applied voltage

21
Q

Define impedance

A

Total opposition to the flow of current in an electrical circuit

22
Q

Describe a basic OR gate

A

A standard logic symbol that has two or more inputs, and one output only one of the two input signals must be received (true) in order for there to be an output, signal transmitted

23
Q

What is the standard unit of measurement for frequency?

A

Hertz

24
Q

Describe a basic AND gate

A

Standard logic symbol that has two more inputs, and one output the two input signals must be received true in order for them to be an output, signal, transmit it

25
Q

What is the basic unit of measurement for capacitance?

A

Farad

26
Q

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

A

Magnetic flux, or flex lines

27
Q

What does the acronym LED stand for

A

Light emitting diode

28
Q

What is one of the most frequent causes of damage to solid state components, and integrated circuits

A

Electrostatic discharge (ESD) from the human body due to careless handling

29
Q

What is the acronym ESD stand for

A

Electrostatic discharge

30
Q

Why is a Hydro meter not used to measure the state of charge of a nickel cadmium battery?

A

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

31
Q

What is meant by electromagnetic induction

A

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

32
Q

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

A

Fully covering the plates, but only up to the level of the indicator in the cell

33
Q

What is the basic unit of measurement for voltage?

A

The volt

34
Q

What is the basic unit of measurement for current?

A

Amp

35
Q

What is the basic unit of measurement for resistance?

A

Ohm

36
Q

How can you identify a basic resistor?

A

By the color bands on it

37
Q

Name at least two types of resistors

A

Fixed, variable, rheostat, potentiometer, thermistor

38
Q

What are three things must all electrical circuits contain

A

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

39
Q

What component creates capacitance in AC circuit?

A

Capacitor

40
Q

How does a capacitor, store electricity?

A

electrostatic charge

41
Q

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

A

The total opposition to current flow

42
Q

What are two reasons that might cause a nickel cadmium battery to fail to deliver it’s rated capacity

A

Faulty cells or cell imbalance

43
Q

What electrical values are measured by typical multimeter

A

Voltage, current, resistance

44
Q

When using a multimeter what setting or type a check is typically used to determine an open in a conductor

A

Continuity

General (11 decks)

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