What is the resistance of the soldering iron winding if at a voltage of 127V the force in it is 500 mA?

Given:

U = 127 Volts – voltage of the electrical network;

I = 500 milliamperes – current in the winding of an electric soldering iron.

It is required to determine R (Ohm) – the resistance of the soldering iron winding.

Let’s convert the amperage from milliamps to amperes:

I = 500 mA = 500/1000 = 0.5 Ampere.

Then the resistance of the soldering iron winding will be equal (from Ohm’s law):

R = U / I = 127 / 0.5 = 254 ohms.

Answer: the resistance of the soldering iron winding will be equal to 254 ohms.