Problem 26.13 ) Part A Constants The \"power cube\" transformer for a portable C

Question

Problem 26.13 ) Part A Constants The "power cube" transformer for a portable CD player has an output of 6.9 V and 750 mA (both rms) when plugged into a 120 V outlet. If the primary coil has 400 turns of wire, how many turns are on the secondary coil? Express your answer using two significant figures. 16 A2+ 6 + O 2 ? U N- N = turns Submit Request Answer Part B What is the peak current in the primary coil? Express your answer to two significant figures and include the appropriate units. PÅ 6 + O 2 ? Value Units I- Submit Request Answer

Explanation / Answer

a) Vs / Vp = Ns / Np

Ns = (Vs / Vp) * Np

= (6.9 / 120) * 400

Number of turns in secondary coil = 23 turns

b) 6.9 * 750 = 120 * Irms

I rms  = 43.12 mA

Ipeak = sqrt(2) * Irms

peak current in primary coil = 60.9 mA

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