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A-Level Physics > Chapters 13 and 14: Electricity > Flashcards

Chapters 13 and 14: Electricity Flashcards

1
Q

What is current?

A

The rate of flow of charge

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2
Q

What is the equation for current?

A

I = ∆Q / ∆t

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3
Q

What is potential difference?

A

The amount of electrical work done per unit charge through a component

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4
Q

What is the equation for potential difference?

A

V = W/ Q

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5
Q

What is electromotive force?

A

The amount of electrical work done per unit charge by a power supply in an electric circuit

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6
Q

What is the equation for electromotive force?

A

ε = E/Q

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7
Q

What is resistance?

A

A measure of the opposition of a conductor to electric current flowing through it

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8
Q

What is the equation for Ohm’s Law?

A

R = V/ I

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9
Q

What is Ohm’s Law?

A

The current and potential difference through an ohmic conductor under constant physical conditions are proportional

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10
Q

What is a thermistor?

A

A temperature sensitive semiconductor whose resistance increases when temperature decreases. It has a negative temperature coefficient

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11
Q

What is a superconductor?

A

A material which has zero resistivity when the temperature is decreased to, or below, the material’s critical temperature.

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12
Q

What are some real applications of superconductors?

A

Maglev trains, MRI scanners, particle accelerators

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13
Q

What can superconductors be generally used for?

A

The production of strong magnetic fields and the reduction of energy loss in transmission of electric power

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14
Q

What is resistivity?

A

The intrinsic resistance of a material independent of the dimensions of the substance

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15
Q

What is the equation for resistivity?

A

ρ= RA/l

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16
Q

What are three equations for power through a component?

A

P = IV
P = I2R
P= V2 / R

17
Q

What is Kirchoff’s first circuit law?

A

Sum of I = 0

18
Q

What is Kirchoff’s second circuit law?

A

Sum of emf = sum of pd

19
Q

What is a potential divider?

A

A method of splitting a potential difference, by connecting two resistors in series. The total potential difference is split in the ratio of their resistances.

20
Q

What is internal resistance?

A

The resistance to the flow of charge within a source. Internal resistance results in energy being dissipated within the source.

21
Q

What is the equation for internal resistance?

A

V = ε - rI

22
Q

What is the terminal pd?

A

The potential difference across the terminals of a power source. It is equal to the source’s emf minus any voltage drop over them source’s internal resistance.

A-Level Physics (16 decks)

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