Vs = 200/25 * 12=96 V.=Secondary voltage
I = Vs/20 = 96/20 = 4.8 Amps.
A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ω device is connected to the secondary coil, calculate the current in Amperes passing through the device.
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