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Electrical II > Everything else > Flashcards

Everything else Flashcards

1
Q

branch

A

any portion of a circuit that can be simplified as having two terminals

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2
Q

very useful for controlling the voltage in another circuit.

A

Potentiometers

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3
Q

Unit of capacitance

A

the farad

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4
Q

The total capacitance of two capacitors connected in series is less than that of either capacitor alone

A

True

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5
Q

If a conductor has a capacitance of one farad, a transfer of one coulomb of charge to the conductor will increase its potential by one volt.

A

True

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6
Q

The capacitance of a given capacitor will be higher if the separation of the plates is reduced without changing the dielectric.

A

True

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7
Q

Insertion of a dielectric between the plates of a capacitor decreases the voltage across it and hence reduces the capacitance.

A

False

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8
Q

If the charge on a capacitor is doubled, the potential energy will be quadrupled.

A

True

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9
Q

For capacitors connected in parallel, the voltage across each capacitor is the same as that across the source.

A

True

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10
Q

The amount of charge that can be placed on a conductor does not depend on

A

its potential

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11
Q

The capacitance of a capacitor increases with a decrease in

A

plate separation

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12
Q

The total voltage is the sum of the voltages across each capacitor.

A

capacitors in series

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13
Q

have the ability to store a charge

A

Capacitors

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14
Q

Capacitance is directly proportional to

A

charge

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15
Q

is a measure of how easy it is to establish electric flux in a material

A

Permittivity

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16
Q

Capacitors in series are treated the same as

A

resistors in parallel

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17
Q

The dielectric constant may also be referred to as the relative

A

of a material

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18
Q

The total capacitance of a number of capacitors connected in series is_________the capacitance of any capacitor taken individually

A

less than

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19
Q

The_____________for a material is the ratio of the capacitance with that material between the plates to the capacitance for a vacuum between the plates.

A

dielectric constant

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20
Q

A group of capacitors connected directly to the same source of potential difference so that the available charge is shared are said to be connected in

A

parallel

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21
Q

Current in a capacitor exists only while capacitor voltage

A

is changing

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22
Q

A capacitor stores charge Q at a potential difference ΔV. If the voltage applied by a battery to the capacitor is doubled to 2ΔV

A

the capacitance remains the same and the charge doubles

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23
Q

Two capacitors are identical. They can be connected in series or in parallel. If you want the smallest equivalent capacitance for the combination, you should connect them in

A

series

24
Q

Consider two identical capacitors. Each capacitor is charged to a voltage of 10 V. If you want the largest combined potential difference across the combination, you should connect them in

A

series

25
Q

You have three capacitors and a battery. In which of the following combinations of the three capacitors will the maximum possible energy be stored when the combination is attached to the battery?

A

parallel

26
Q

refers to the force that acts between magnets and magnetic materials

A

Magnetism

27
Q

a magnetic field is a

A

force field

28
Q

The lines of force between the north pole and south pole of a permanent magnet or an electromagnet.

A

Magnetic flux

29
Q

The SI unit of magnetic flux, which represents

108lines

A

Weber (Wb)

30
Q

The measure of ease with which a magnetic field can be established in a material

A

Permeability

31
Q

The opposition to the establishment of a magnetic field in a material

A

Reluctance

32
Q

Faraday’s law

A

A law stating that the voltage induced across a coil of wire equals the number of turns in the coil times the rate of change of the magnetic flux

33
Q

A unit of flux density that is the same as a Wb/m2 is the

A

tesla

34
Q

The Weber is a unit of what?

A

Magnetic Flux

35
Q

The cause of magnetic flux is

A

magnetomotive force

36
Q

The measurement unit for permeability is

A

weber/ampere-turn-meter

37
Q

The measurement unit for relative permeability is

A

dimensionless

38
Q

The property of a magnetic material to behave as if it had a memory is called

A

hysteresis

39
Q

In a series capacitor circuit, the total capacitance is

A

Smaller than the smallest individual capacitor value

40
Q

The control voltage for a relay is applied to the

A

coil

41
Q

When the current through a coil changes, the induced voltage across the coil will

A

oppose the change in the current that caused it

42
Q

Magnetic Lines of Force, go from North to South.
And never

A

cross over each other

43
Q

Loads are commonly connected in:

A

In parallel so that they operate independently

44
Q

Michael Faraday & Joseph Lenz

A

The two people mostly responsible for our ideas concerning inductance and induced voltages

45
Q

Voltage is induced in a circuit whenever the flux linking (i.e., passing through) the circuit is changing and that the magnitude of the voltage is proportional to the rate of change of the flux.

A

Faraday’s Law

46
Q

The greater the number of flux lines cut per unit time or the stronger the magnetic field strength

A

the greater will be the induced voltage across the conductor

47
Q

an induced current is always such a direction to oppose the motion or change causing it.

A

Lenz’s law

48
Q

Reluctance is the same to a magnetic circuit as _________is to an electric circuit

A

Resistance

49
Q

L is called the self-inductance of the coil, and in the SI system its unit is the

A

henry

50
Q

capacitors in series are treated the same as

A

resistors in parallel

51
Q

The law that states that the induced effect is such that it opposes the cause that produced it is:

A

Lenz’s Law

52
Q

Increasing levels of inductance can be obtained by placing inductors

A

in series

53
Q

The inductance of a multi-turn coil depends on

A

geometry of coil

54
Q

The unit of inductance (henry) is equivalent to

A

Wb/A

55
Q

Using inductance to shift from measuring flux changes to measuring current
changes simplifies the use of whose law?

A

Faraday

56
Q

The permittivity constant is generally denoted by

A

ε

57
Q

The summation of currents entering a node is equal to the summation of currents leaving the node

A

Kirchhoff’s Current Law

Electrical II (2 decks)

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