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Other parts of the system may experience severe voltage drops. Calculating Short Circuit Current
) in the denominator approaches zero, resulting in an exceptionally high current ( Common Causes current in short circuit
Consider a simple example. A car battery provides 12 volts. A typical headlight bulb might have a resistance of 5 ohms, drawing a safe current of 12V / 5Ω = 2.4 amperes. However, if a wrench falls across the battery’s positive and negative terminals, the short circuit path might have a total resistance of only 0.01 ohms (mostly from the wrench’s metal and the battery’s internal resistance). The resulting current would be 12V / 0.01Ω = 1,200 amperes. This is not just a small surge; it is a current three orders of magnitude larger than the circuit was designed to handle. This massive current is the fundamental source of all the destructive effects associated with short circuits. Other parts of the system may experience severe