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P = V x I.                  Power = Voltage x Current.

E = V x I x t.     Energy = Voltage x Current x time.

V = I x R.            Voltage = Current x Resistance.

Q = I x t.                        Charge = Current x time.

W = F x d.            Work done = Force x distance.

W = E.              Work done = Energy transferred.

s = d ÷ t.                       speed = distance ÷ time.

           a = (v-u) ÷ t.      acceleration = change in velocity ÷ time.

p = m x v.              momentum = mass x velocity.

w = m x g.                      weight = mass x gravity.

p = F ÷ a.                       pressure = Force ÷ area.

d = m ÷ v.                     density = mass ÷ volume.

       v = f x λ.     wave speed  =  frequency  x  wavelength.

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