# Generator Efficiency

From DIDEAS Wiki

# Electrial Efficiency

Efficiency as a fraction input mechanical power that is available at the output terminals:

E = Pout / (Pout + Ploss) Pout = I^2 * Rl Ploss = I^2 * Rm thus E = I^2 * (Rl / (Rl+Rm))

let Rl = k * Rm then E = k/(1+k)

for a given desired efficiency keep Rl >= Rm * E/(1-E)

k = 4 -> 80% k = 9 -> 90%