# A 120 W electric soldering iron is designed for a voltage of 220 volts, determine the current strength

December 29, 2020 | education

| **A 120 W electric soldering iron is designed for a voltage of 220 volts, determine the current strength in the soldering iron winding and its resistance.**

Let’s remember the formula for calculating the power:

P = UI

Since the rated voltage is given to us, we find the calculated current strength:

I = P / U = 120/220 = 0.55A

R = U / I = 220 / 0.55 = 400 Ohm

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