Chapter 21. Input and output voltages for a transformer (21-10)

Question

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{"title":"Amplitudes of the input (p) and output (s) voltages","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"5,3,36,35\"},{\"shape\":\"rect\",\"coords\":\"5,58,35,91\"}]"} {"title":"Number of windings in the primary coil (p) and secondary coil (s)","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"254,0,290,37\"},{\"shape\":\"rect\",\"coords\":\"254,58,290,93\"}]"} {"title":"Rms values of the input (p) and output (s) voltages","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"104,3,134,38\"},{\"shape\":\"rect\",\"coords\":\"103,57,133,89\"}]"}

Question

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{"title":"Amplitudes of the input (p) and output (s) voltages","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"5,3,36,35\"},{\"shape\":\"rect\",\"coords\":\"5,58,35,91\"}]"} {"title":"Number of windings in the primary coil (p) and secondary coil (s)","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"254,0,290,37\"},{\"shape\":\"rect\",\"coords\":\"254,58,290,93\"}]"} {"title":"Rms values of the input (p) and output (s) voltages","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"104,3,134,38\"},{\"shape\":\"rect\",\"coords\":\"103,57,133,89\"}]"}

Question

Zt4D9Q0a6uMZfPJY8LT/qgiV05eSyWE5BSpk7EFxXhkdf7VuGsocfwGeX18yODjsh1e920g8XlY=

{"title":"Amplitudes of the input (p) and output (s) voltages","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"5,3,36,35\"},{\"shape\":\"rect\",\"coords\":\"5,58,35,91\"}]"} {"title":"Number of windings in the primary coil (p) and secondary coil (s)","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"254,0,290,37\"},{\"shape\":\"rect\",\"coords\":\"254,58,290,93\"}]"} {"title":"Rms values of the input (p) and output (s) voltages","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"104,3,134,38\"},{\"shape\":\"rect\",\"coords\":\"103,57,133,89\"}]"}

Review

In other words, in a transformer the ratio of the number of windings in the secondary coil (\(N_{\mathrm{s}}\)) to the number of windings in the primary coil (\(N_{\mathrm{p}}\)) determines the output voltage relative to the input voltage. In a step-up transformer, \(N_{\mathrm{s}}\) is greater than \(N_{\mathrm{p}}\), so the output voltage is greater than the input voltage. In a step-down transformer, \(N_{\mathrm{s}}\) is less than \(N_{\mathrm{p}}\), which results in an output voltage less than the input voltage.