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Physics Equations Sheet
Power = Voltage x Current
(Watts, W) (Volts, V) (Amps, I)
P = V x I
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Voltage = Current x Resistance
(Volts) (Amps) (Ohms)
V = I x
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Charge = Current x time
(Coulombs) (Amps) (Seconds)
Q = I x t
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Energy = Voltage…

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Power = Energy ÷ Time
(Watts) (Joules) (Seconds)
P = E ÷ t
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Speed = Distance ÷ Time
s = d ÷ t
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Acceleration = Change in velocity ÷ time
(m/s) (seconds)
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Resultant force = mass x acceleration
(N) (Kg) (m/s2)
F = m x a…

Page 3

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Payback Time = cost of installation ÷ savings per year in fuel
costs
(Years) (£) (£)
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Potential difference = current × resistance
(Voltage, V) (Amperes, I) ()

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