Short Circuit Current Calculator

Voltage (Volts):

Resistance during Short Circuit (Ohms):

Calculate

Result

 

Short Circuit Current Calculator (Formula)

The Short Circuit Current Calculator is a tool used to determine the current that flows through a circuit when a short circuit occurs. A short circuit happens when there is a low-resistance path between the positive and negative terminals of a voltage source, bypassing most of the intended load.

The formula to calculate short circuit current is:

Where:

• I is the short circuit current in amperes (A).
• $V$ represents the voltage of the source in volts (V).
• R​ is the resistance during the short circuit in ohms (Ω).

This formula is based on Ohm’s Law, which states that the current ($I$) in a circuit is equal to the voltage ($V$) divided by the resistance ($R$). In a short circuit, the resistance is very low, approaching zero, which leads to a very high current flow. It’s crucial to design circuits and install protective devices to prevent potentially dangerous short circuits.