Problem 26.10 A soldering iron uses an electric current in a wire to heat the ti

Question

Problem 26.10 A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 51W at an rms voltage of 22V. Assume that the soldering iron is plugged into a 120 V outlet. What is the resistance of the wire in the iron? Express your answer using two significant figures. R = ________ Ohm Part B How many turns are in the primary coil? Express your answer using two significant figures. ___________ turns Part C What is the current in the primary coil?

Explanation / Answer

apply i1/i2 = N2/N1

P2 = V2i2

i2 = 51/22 = 2.318 A

so i1 = 2.318* 100/545.45 = 0.424 AMps

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