equations

equations

1. Electricity

   • P = V x I. power = voltage x current.
   • V = I x R voltage = current x resistance.
   • E = V x Q. energy = voltage x charge.
   • E = V x I x t. energy = voltage x current x time
   • E = c x m x θ. energy = specific heat capacity x mass x change in temperature.

2. Forces and Motion

   • s = d ÷ t. speed = distance ÷ time
   • a = (v-u) ÷ t. acceleration = change in velocity ÷ time
   • F = m x a. Force = mass x acceleration.
   • w = m x g. weight = mass x gravity.
   • p = m x v. momentum = mass x velocity
   • (mv - mu) = F x t. change in momentum = Force x time.
   • d = m ÷ v. density = mass ÷ volume.
   • p = F ÷ a. pressure = force ÷ area.
   • m = F x d. moment = force x perpendicular distance from pivot

3. waves

   • v = f x λ. velocity = frequency x wavelength.

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