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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