Work done (W)

W= Fs

work done= force x distance

Kinetic energy (Ek)

Ek= 1/2mv^{2 }

kinetic energy= 0.5 x mass x (speed)^{2}

Gravitational potential energy (Ep)

Ep= mgh

gravitational potential energy= mass x gravitational field strength (g) x height

Power (energy transferred)

P= E/t

power= energy transferred/time

Power (work done)

P= W/t

power= work done/time

Efficiency

useful output energy transfer/total input energy transfer useful power output/total power output

Charge flow (Q)

Q= It

charge flow= current x time

Potential difference (V)

V= IR

potential difference= current x resistance

Power (P)

P= I^{2}R

power= (current)^{2} x resistance

Power (P)

P= VI

power= potential difference x current

Energy transferred (E)

E= Pt

energy transferred= power x time

Energy transferred (E)

E= QV

energy transferred= charge flow x potential difference

Density (p)

p= m/v

density= mass/volume

Elastic potential energy (Ee)

Ee= 1/2ke^{2}

elastic potential energy= 0.5 x spring constant x (extension)^{2}

Change in thermal energy

/|E= mc/|Ø

change in thermal energy= mass x specific heat capacity x temperature change

Thermal energy for a change of state

E= mL

thermal energy for a change of state= mass x specific latent heat

For gases= constant

pV= constant

pressure x volume= constant