Electronics Flashcards

1
Q

V =

A

V = I R

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2
Q

A current of one amp is the charge flow of…

A

One Coulomb per second

1 A = 1 C s-1

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3
Q

Force between two charges F =

A

F =( Q1 Q2 ) / ( 4 π εo r2 )

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4
Q

Force exerted by an electric field F =

A

F = Q E

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5
Q

Electric field created between plates E =

A

E = V / d

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6
Q

Potential energy U, stored by electric charge U =

A

U = ( Q1 Q2 ) / ( 4 π εo r)

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7
Q

Magnetic field B =

A

B = ( μo I ) / (2 π r)

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8
Q

Magnetic field internal Binternal =

A

Binternal​ = ( μo N I ) / L

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9
Q

Motion of charged particle in uniform magnetic field… v / r =

A

v / r = ω = QB / m

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10
Q

Motion in a complex magnetic field… r =

A

r = mv / eB

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11
Q

Force between two electric currents F =

A

F = ( μo / 2π ) (L I1 I2 / d)

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12
Q

Torque on a current loop… τ =

A

τ = mB sinθ

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13
Q

Total resistance in series… R =

A

R = R1 + R2 + R3 + …

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14
Q

Total resistance in parallel… 1 / R =

A

1/ R = 1/ R1 + 1/ R2 + 1/ R3

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15
Q

State Thevenin’s theorem…

A

Any combination of batteries and resistors with two terminals can be replaced by a single voltage source “e” and a single series resistor “r.”

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16
Q

The Thevenin voltage “e” is the…

A

…Open circut voltage between terminals A and B.

17
Q

The Thevenin resistance “r” is the…

A

…Resistance seen between terminals A and B when voltage sources are replaced with short circuits.

18
Q

Gain for an open loop Gainopen-loop =

A

Gain = Vout / Vin = Ao

19
Q

Gain for a closed loop negative feedback…. Gainclosed-negative =

A

Gain = Vout / Vin = Ao / (1 + AoB)

(1 - AoB) for positive feedback

20
Q

Formula for an inverting Op-Amp… Vout/ Vin =

A

Vout/ Vin = - Rf / Rin

21
Q

Formula for Summing Amplifier… Vout / Rf =

A
  • ( V1 / R1 + V2 / R2)
22
Q

The energy between two point charges U =

A

U = ( Q1Q2 )/ 4πεor

23
Q

Describe the relation between electric potential and potential energy.

A

Electric potential is the potential energy per unit charge.

24
Q

Define what is meant by power in an electrical circuit?

A

P[watts] = V I

25
Relationship between resistance R and resistivity ρ of a wire... R =
R = ρL / A
26
State Kirchhoff's junction rule...
The algerbraic sum of the currents into any junction is zero Σ I = 0
27
State Kirchhoff's loop rule...
The algebraic sum of the potential differences in any loop, including those associated with emfs and those of resisitve elements, must equal zero. Σ V = 0 (valid for any closed loop)
28
State the three fundamental variables which characterise an amplifier
Gain, Input impedance and Output impedance
29
What is the relationship between Power, Resistance and Current?
P = I2 R
30
State the vector form of Coulomb's Law...
F = (( Q1 Q2 ) / 4πεor2) r^
31
Electric field between two plates E =
E = ΔV /d
32
Force on charge in electric field F =
F = q E