Question

Please answer and show formula

Answer 1

Voltage = 5 volts

`\sf (number \ of \ turns \ in \ primary \ coil)/(voltage\ in \ primary \ coil) = (number \ of \ turns \ in \ secondary\ coil)/(voltage\ in \ secondary\ coil)`

`\hookrightarrow \sf (400)/(100) = (20)/(V_2)`

`\hookrightarrow \sf 400V_2}{} = 20*100`

`\hookrightarrow \sf V_2 = 5 V`