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ENGAA > Equations > Flashcards

Equations Flashcards

1
Q

Current

A 
Current = Charge/Time
I = Q/t
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2
Q

Resistance

A 
Resistance = Voltage/Current
R = V/
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3
Q

Voltage in terms of charge and energy

A 
Voltage = Energy/Charge
V = E/Q
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4
Q

Power in terms of current and voltage

A 
Power = Current x Voltage
P = IV
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5
Q

Power in terms of current and resistance

A 
Power = Current^2 x Resistance 
P = I^2R
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6
Q

Energy transfer

A

Energy transfer = power x time

E = VIt

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7
Q

Relationship between number of turns on the primary and secondary coil and the voltages of each in transformers

A

Vp/Vs = np/ns

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8
Q

Relationship between power at 100% efficiency in transformers

A

VpIp = VsIs

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9
Q

Speed

A

Speed = Distance/Time

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10
Q

Velocity

A

Velocity = Change in Displacement/Time

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11
Q

Acceleration

A

Acceleration = Change in Velocity/Time

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12
Q

Average Speed

A

Average Speed = Total Distance/Total Time

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13
Q

Velocity^2 (SUVAT)

A

v^2 = u^2 + 2as

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14
Q

Energy stored in a stretched spring/strain energy in terms of force

A

E = 1/2Fx

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15
Q

Energy stored in a stretched spring/strain energy in terms of the spring constant

A

E = 1/2kx^2

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16
Q

Newton’s Second Law

A 
Force = Mass x Acceleration
F = ma
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17
Q

Weight

A 
Weight = Mass x Gravitational Constant 
W = mg
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18
Q

Momentum

A 
Momentum = Mass x Velocity
p = mv
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19
Q

Force in terms of momentum

A

Force = Rate of Change in Momentum

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20
Q

Work

A

Work = Force x Distance Moved in Direction of Force

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21
Q

Gravitational Potential Energy

A

Gravitational Potential Energy = Mass x Gravitational Constant x Change in Height
GPE = mgh

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22
Q

Kinetic Energy

A

Kinetic Energy = 1/2 x Mass x Velocity^2

KE = 1/2mv^2

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23
Q

Power in terms of energy transfer

A

Power = Energy Transfer/Time

24
Q

Percentage efficiency of energy

A

Percentage Energy = (Useful Output/Total Input) x 100

25
Q

Specific Heat Capacity

A

Specific Heat Capacity = Thermal Energy/(Mass x Temperature Change)

26
Q

Relationship between pressure on a gas and volume at a constant temperature

A

PV = constant

27
Q

Density

A 
Density = Mass/Volume
p = m/v
28
Q

Pressure with force

A

Pressure = Force/Area

29
Q

Hydrostatic Pressure

A

Hydrostatic Pressure = Height(Depth) of Liquid x Pressure x Gravitational Constant

30
Q

Frequency of a wave

A 
Frequency = 1/Time Period
f = 1/T
31
Q

Wave speed in terms of distance and time

A

Wave Speed = Distance/Time

32
Q

Wave speed in terms of frequency and wavelength

A

Wave Speed = Frequency x Wavelength

V = f(lambda)

33
Q

Relationship between angle of incidence and angle of reflection

A

Angle of Incidence = Angle of Reflection

34
Q

Moment

A

Moment = Force x Perpendicular Distance from the Point to the Line of Action of the Force

35
Q

Velocity (SUVAT)

A

v = u + at

36
Q

Distance (SUVAT with t^2)

A

s = ut + ½(at^2)

37
Q

Distance (SUVAT with u and v)

A

s = ½(u + v)t

38
Q

Power in terms of force and velocity

A

Power = Force x Velocity

39
Q

Impulse

A

Impulse = Force x Change in Time

40
Q

Efficiency of energy transfer

A

Efficiency = (Useful Energy Transfer/Total Energy Input) x 100

41
Q

Pressure with normal force

A

Pressure = Normal Force/Area

42
Q

Spring constant

A

Spring Constant = Force/Extension

43
Q

Young modulus

A

Young Modulus = Stress/Strain

44
Q

Stress

A

Stress = Force/Cross-Sectional Area

45
Q

Strain

A

Strain = Extension/Un-stretched Length

46
Q

Refractive index in terms of wave speed

A

Refractive Index = Speed1/Speed2

47
Q

Refractive index in terms of angle

A

Refractive Index = sin(theta1)/sin(theta2)

48
Q

Refractive index in terms of the critical angle

A

Refractive Index = 1/sin(Critical Angle)

49
Q

Charge in terms of current and time

A

Charge = Current x Time

50
Q

Potential difference in terms of work done and charge

A

Potential Difference = Work Done/Charge

51
Q

Voltage in terms of current and resistance

A

Voltage = Current x Resistance

52
Q

Power in terms of voltage and resistance

A

Power = Voltage^2/Resistance

53
Q

Resistivity

A

Resistivity = Resistance x (Cross-Sectional Area/Length)

54
Q

Relationship between voltage in and voltage out and resistance 1 and resistance 2 in a potential divider circuit

A

Vout/Vin = R1/(R1 + R2)

55
Q

Relationship between V1 and V2 and R1 and R2 in a potential divider circuit

A

V1/V2 = R1/R2

ENGAA (2 decks)

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