Calculation Formulas for Voltage Drop 1. **Calculation Formula for Voltage Drop in DC Circuits** - For a DC circuit with pure resistance, according to Ohm's Law \\(U = IR\\), where \\(U\\) is the voltage drop (in volts, V), \\(I\\) is the current (in amperes, A), and \\(R\\) is the resistance (in ohms, \\(\\Omega\\)). - For example, in a DC circuit, if the resistance \\(R = 10\\Omega\\) and the current \\(I = 2A\\), then according to the formula, the voltage drop \\(U = IR = 2A\\times10\\Omega =