Paper 2 Equations

• Work done = force x distance
• Power = work done / time
• Moment = force x distance
• Sum of clockwise moment = sum of antii-clockwise moment
• Energy = charge x potential difference
• Charge = current x time
• Potential difference = current x resistance
• Power = energy / time
• Power = current x potential difference
• Power = current^2 x resistance
• Force = magnetic flux density x current x length
• Voltage primary coil / voltage secondary coil = turns primary coil / tyrns secondary coil
• Voltage in primary coil x current in primary coil = voltage in secondary coil x current in secondary coil
• Density = mass / volume
• Change in thermal energy = mass x SHC x change in temp
• Energy for change in state = mass x SLH
• 1 celcius = 273.15 kelvin
• Force = spring constant x extension
• Energy transfered = 1/2 x spring constant x extension^2
• Pressure = force / area
• Pressure in liquid = height x density x g