Topic 1-Key Concepts of Physics

• What is the SI unit for length?

  Metre, m
• What is the SI unit for mass?

  Kilogram, kg
• What is the SI unit for time?

  Second, s
• What is the SI unit for electric current?

  Ampere, A
• What is the SI unit for temperature?

  Kelvin, K
• What is the SI unit for amount of substance?

  Mole, mol
• What is the SI unit for electric potential difference?

  Volt, V
• What is the SI unit for frequency?

  Hertz, Hz
• What is the SI unit for force?

  Newton, N
• What is the SI unit for energy?

  Joule, J
• What is the SI unit for power?

  Watt, W
• What is the SI unit for pressure?

  Pascal, Pa
• What is the SI unit for electric charge?

  Coulomb, C
• What is the SI unit for electrical resistance?

  Ohm, Ω
• What is the SI unit for magnetic flux density?

  Tesla, T
• What is the equation for distance?

  distance = speed × time
• What is the equation for acceleration?

  a = (v − u) / t
• What is the equation for force?

  F = ma
• What is the equation for weight?

  weight = mg
• What is the equation for change in gravitational potential energy?

  ∆GPE = mg∆h
• What is the equation for kinetic energy?

  KE = $\frac{1}{2} mv^2$
• What is the equation for efficiency?

  efficiency = useful energy output / total energy input
• What is the equation for wave speed?

  wave speed = v = fλ
• What is the equation for work done?

  work done = force × distance
• What is the equation for power?

  Power = work done / time
• What is the equation for moment of force?

  Moment of force = force × perpendicular distance
• What is the equation for energy transferred by charge?

  energy transferred = charge moved × pd
• What is the equation for charge?

  charge = current × time
• What is the equation for voltage?

  Voltage = Current × Resistance
• What is the equation for electrical power?

  Electrical Power = current × pd
• What is the equation for electrical power in terms of resistance?

  Electrical power = current² × resistance
• What is the equation for density?

  density = mass / volume
• What is the equation for force on a spring?

  force on spring = spring constant × extension
• What is the equation for pressure?

  pressure = force / area
• What is the equation for energy transferred in a transformer?

  energy transferred = IVt
• What is the equation for voltage in a transformer?

  pd across primary / pd across secondary = number of turns in primary / number of turns in secondary
• What is the equation for power in a transformer?

  power of primary = power of secondary
• What is the equation for change in energy?

  change in energy = mass × specific heat capacity × temp change
• What is the equation for energy in terms of latent heat?

  energy = mass × specific latent heat
• What is the equation for pressure and volume change?

  P1V1 = P2V2