Ω
Ohm's Law
U = I × R — the foundation of every circuit calculation.
The triangle
Cover the value you need: U = I × R, I = U / R, R = U / I.
Fault current
Earth fault current If = U0 / Zs. With U0 = 230 V and Zs = 1 Ω, If = 230 A.
Key regulations
411.4.4