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Frist > 2-7 Lol > Flashcards

2-7 Lol Flashcards

1
Q

Electric circuit consists of what 3 parts

A

Power source, conductors, load

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2
Q

What is a load

A

The device that uses electrical energy

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3
Q

What do switches do

A

Open and close circuits

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4
Q

The ____ of the voltage source determines direction of current flow, and the ______ of voltage determines hiw much current will flow

A

Polarity; amount

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5
Q

What two factors determine how much current flows in a dc circuit

A

Amount of source voltage, how well the load and wires conduct current

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6
Q

The ease with which a metal allows current to flow is described by the term

A

Conductance

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7
Q

The resistance of any material depends on

A

The number of free electrons the material has

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8
Q

In most cases, the resistance of the load is much _____ than the resistance of the circuit wiring

A

Greater

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9
Q

The property of maintaining a small tolerance under all operating conditions is called the ______ of the resistor

A

Stability

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10
Q

Resistor using three terminals

A

Potentiometer

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11
Q

Resistor using 2 terminals

A

Rheostat

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12
Q

When solving using Ohm’s law, a good practice is to think in terms of

A

Knowns and unknowns

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13
Q

The rate at which work is done

A

Power

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14
Q

Total power consumed is measured in

A

Kilowatt hours

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15
Q

1 kilovolt=

A

1000 volts

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16
Q

In a series circuit, the total power consumed iat equal to

A

The sum of the power used by each individual load

17
Q

Most resistor failures result from

A

Heat genwyrated in the resistor by the current flow

18
Q

Maximum value that the current ir voltage can reach (in ac current)

A

Amplitude or peak value

19
Q

The effective value of a pure sine wave is ____ times the peak value

A

.707

20
Q

The ____ of an ac current and its ____ determune the magnitude if the self-induced emf

A

Frequency; amplitude

21
Q

The magnetic field holds all the energy it has taken from the circuit until the current

A

Begins decreasing

22
Q

Conductors a re sometimes coiled to increase the number of flux lines cut by the conductor and this results in

A

A larger self induced emf

23
Q

In a purely resistive circuit, the power factor equals 1.0 and so the

A

Apparent power= true power

24
Q

In a purely inductive circuit, voltage ____ current

A

Leads

25
Q

In a purely inductive circuit, voltage ____ current

A

Leads

26
Q

In a purely capacitive circuit, current ____ voltage

A

Leads

27
Q

______ _______ are used to describe the time relationships between ac voltage and currents

A

Phase angles

28
Q

The ratio of inductance to resistance=

A

Q

29
Q

____ ________ in a series LCR circuit occurs at the frequency at which the net reactance is zero

A

Series resonance

30
Q

Formula for capacitive reactance

A

Xc = 1
———
2πfC

31
Q

Formula for inductive reactance

A

XL= 2πfL

32
Q

Vectoral addition

A

C = the square root of a squared + b squared

33
Q

4 most important quantities to measure with electricity

A

Current, voltage, resistance, power

34
Q

Three types of moving iron meters

A

Radial-vane concentric-vane, and plunger

35
Q

Moving coil meter movement is used most often because

A

It is more sensitive and more accurate

36
Q

Ac can b converted into dc by a device called a

A

Rectifier

37
Q

The _____ makes it possible to measure currents much greater than could be measured by meter movement alone

A

Shunt

38
Q

Voltmeters must be in _______ with the circuit component being measured

A

Parallel

39
Q

______ __________ are added in series with the coil to extend the voltagr range of a meter movement

A

Multiplier resistors

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