Some electronic devices operate on a DC voltage of 8.5 V. To obtain 8.5 V DC from a 120-V (rms) AC line, first the voltage is dropped to 8.5 V (rms) AC by a transformer, and then the 8.5 V AC is converted to 8.5 V DC by a rectifier circuit involving diodes. Consider a device of resistance 8.5 Ω connected to the 8.5-V DC output of the rectifier.
Calculate the ratio of primary to secondary turns of the transformer.
How much power, in watts, is delivered to the device?
Assuming no power loss anywhere, what is the rms current, in amperes, in the secondary winding?
Again assuming no power loss anywhere, what is the rms current, in milliamperes, in the primary winding?