A transformer is used to convert $120 \mathrm{V}$ to $9.0 \mathrm{V}$ for use in a portable CD player. If the primary, which is connected to the outlet, has 640 turns, how many turns does the secondary have?
Added by Virginia M.
Step 1
We know the primary voltage $V_p = 120 \mathrm{V}$ and the secondary voltage $V_s = 9.0 \mathrm{V}$. Show more…
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