electricity Flashcards

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1
Q

What is defined as the energy transferred when one coulomb of charge moves between one point and another?
(eg. through a cell or across a bulb)

A

potential difference

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2
Q

what is one volt equal to?

A

1 joule of energy per coulomb of charge

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3
Q

what is defined as the rate of flow of charge?

A

current

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4
Q

what is the capacity to do work?

A

energy
E = W

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5
Q

what is power?

A

the rate at which energy is transferred
(or work is done)

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6
Q

what 4 factors affect resistivity?

A

temperature
length
cross-sectional area
material

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7
Q

what is a superconductor

A

zero resistance below the critical temperature

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8
Q

what is the equation for resistance?

that includes resistivity

A

R=PL/A
resistance = resistivity x length / area

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9
Q

what is Ohm’s law?

A

current is directly proportional to potential difference

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10
Q

what is the property of an ideal voltmeter?

A

infinite resistance

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11
Q

what is the property of an ideal ammeter?

A

0 reistance

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12
Q

what is meant by electromotive force (e.m.f) ?

A

the work done in moving one coulomb of charge through the supply . this is equal to the max p.d. that the cell can supply which occurs when the current drawn is zero

or energy changed to electrical energy per coulomb passing through

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13
Q

what does e.m.f stand for?

A

electromotive force

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14
Q

what is internal resistance?

A

the resistance within the supply (eg. battery) itself

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15
Q

what is the effect of internal resistance?

A

a drop in the potential difference available from the cell

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16
Q

what is resistivity inversely proportional to?

A

object length

17
Q

what is a thermistior?

A

a temperature sensitive semiconductor who resistance increases when temperature decreases

18
Q

give an example of a semiconductor

A

thermistor