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NEUR2006 > Introduction to Electricity > Flashcards

Introduction to Electricity Flashcards

1
Q

Define Faraday’s constant

A

Charge on 1 mole of univalent ions

Avogadro’s no. x charge on each ion

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2
Q

What is Avogadro’s number?

A

6.022 x 10^23

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3
Q

Define current

A

Rate of change of charge over time - dQ/dt

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4
Q

What is the unit of charge (Q)?

A

Coulombs

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5
Q

What is the unit of current (I)?

A

Amperes

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6
Q

Define 1 Ampere

A

Flow of 1C in 1s

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7
Q

What is the unit of resistance (R)?

A

Ohms

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8
Q

Define conductance (G)

A

Reciprocal of resistance - G = 1/R

I = GV

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9
Q

What is the unit of conductance (G)?

A

Siemens

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10
Q

What is the equation for voltage in a series circuit?

A

V = I(R1 + R2)

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11
Q

What is the equation for resistance in a series circuit?

A

Rtotal = R1 + R2

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12
Q

What is the equation for resistance in a parallel circuit?

A

1/Rtotal = 1/R1 + 1/R2

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13
Q

What is a capacitor?

A

Insulator between 2 conductors - stores charge

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14
Q

Define capacitance (C)

A

Charge that can be stored for given voltage

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15
Q

What is the unit of capacitance (C)?

A

Farads

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16
Q

Define 1 Farad

A

Capacitance to store 1C of charge with 1V potential difference

17
Q

What is the equation linking capacitance, voltage, and charge?

A

Q=VC

18
Q

What are the 3 factors that increase capacitance?

A

Larger plate area
Closer plates
Higher absolute permitivity of dielectric material between plates

19
Q

What is the equation linking capacitance and its 3 determining factors?

A 
C = ƐA/d
Ɛ = absolute permitivity of dielectric material
A = area of plate overlap (m^2)
d = distance between plates (m)
20
Q

What is the equation for capacitance in a parallel circuit?

A

Ctotal = C1 + C2 + C3

21
Q

What is the equation for resistance in a series circuit?

A

1/Ctotal = 1/C1 + 1/C2 + 1/C3

22
Q

What is the equation for current flow in RC circuit?

A 
i = Ɛ/R - q/RC
Ɛ = PD of battery
q = time-varying quantity
23
Q

What is the equation for the final charge on a capacitor?

A 
Qfinal = CƐ
Ɛ = PD of battery
24
Q

What is the equation for the time constant?

A

τ = RC

25
Q

How is a cell like an RC circuit?

A

Membrane - capacitor
Ion channels - conductors
PD between cytoplasm and extracellular fluid - -60mV
Ion equilibrium potential - battery

NEUR2006 (10 decks)

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