Equations Flashcards
Equation for specific heat capacity
Change in thermal energy = mass X specific heat capacity X temperature change
change in Et = mc change in temp
Et = J (joules)
SHC = j/kg°c
Temp change = °c
Mass = Kg
What is the equation for Power
Power = Energy / time
P = E / t
Power = W Energy = J Time = seconds
What is the formula for gravitational potential energy
Ep = mgh
Gravitational potential energy = mass X gravitational field strength X height
Ep = J Mass = Kg GFS = 9.8N/Kg Height = Metres
What is the formula for kinetic energy
Ek = 1/2 m v^2
Kinetic energy = 0.5 X mass X velocity^2
Ek = J
Mass =Kg
Velocity = m/s
What is the formula for energy
E = QV
Energy = Charge X potential difference
Energy = joules
Charge = Coulombs (C)
Potential difference = V
What is the formula for potential difference?
V = IR
Potential difference = current X resistance
potential difference = V
Current = amps (A)
Resistance = ohms (Ω)
What is the formula for charge?
Q = IT
Charge = current X time
Charge = C Current = A Time = seconds
What is the formula for acceleration
a = change in v / t
acceleration = change in velocity / time
a = m/s^2 v = m/s t = s
What is the formula for wavespeed?
V = f λ
Wavespeed = frequency X wavelength
V = m/s f = Hz λ = m
What’s is the equation for efficiency?
Efficiency = useful energy output / total energy output
AND
useful power output / total power output
What is a formula for power involving resistance?
P = I^2 R
Power = current^2 X resistance
P = W I = A R = ohms
What is a formula for power involving potential difference?
P = IV
Power = current X potential difference
P = W I = A V = V
What is the formula for work done?
w = fd
work done = force X distance
w = Nm or J f = N (newtons) d = m
What is the formula for pressure?
P = f / a
Pressure = force applied / area of surface
P = N/m^2 f = N a = m^2
What’s is a formula for force involving spring constant?
f = ke
Force = spring constant X extension
f = N k = N/m e = m
