energy transferred = charge flow × potential difference

E = Q V

potential difference across primary coil × current in primary coil = potential difference across secondary coil × current in secondary coil

V_p I_p = V_s I_s

density = mass / volume

ρ = m / V

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

E = m L

weight = mass × gravitational field strength

W = m g

work done = force × distance (along the line of action of the force)

W = F s

force = spring constant × extension

F = k e

distance travelled = speed × time

s = v t

acceleration = change in velocity / time taken

a = Δv / t

(final velocity)² − (initial velocity)² = 2 × acceleration × distance

v² − u² = 2 a s

resultant force = mass × acceleration

F = m a

p = m v

period = 1 / frequency

T = 1 / f

wave speed = frequency × wavelength

v = f λ

F = B I l