Question

An electric soldering gun uses a special transformer to provide plenty of current and I²R heating to the soldering tip. The 120 V soldering gun draws 35watts of power. The transformer has 300 turns on the input side and 6 turns on the output (soldering tip) side.

The power delivered to the tip is:

Group of answer choices

A) 35 W

B) 50 W

C) 2.4 W

D) 600 W

Answer 1

35 Watts only

transformer is constant power device ( input power = output power )

so the total 35W is delivered to the secondary of the transformer

V₁ = 120 V ; V₂ = N₂ / N₁*V₁ = ( 6/300)*120 = 2.4 V

I₁ = P / V₁ = 35/120 = 0.291667 Amp

I₂ = P / V₂ = 35/2.4 = 14.5833 Amp

power delivered to the tip is 35 W only with having a voltage of 2.4 W and tip draws a current of 14.5833 Amp (secondary current)

(CONSIDERED TRANSFORMER IS IDEAL)

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