Which of the following does not change in a transformer

An ac resistance is higher than a dc resistance. True False

Determine Rz for a 12 V Zener regulator is used with a dc input of 20 V, a load current of 65 mA, and a Zener current of 20 mA. Rz DC Input Zener R diode 91.4 ohms O 14.9 ohms 49.1 ohms O 94.1 ohms

what is the answer for peak to peak ripple and dc output voltage? please answer in 4 decimal places thank you

I need the answer quickly

1. An ideal transformer with a 450 turn primary connected to a 600 V, 60 Hz supply line needs to output 240 V from the secondary. A 100 load is connected across the secondary. How many turns the secondary must have to output the desired voltage? What is the current through the load? What is the current drawn through the primary?

100 W ans

I need help with the PSpice part. How do I do the PSpice stuff.

You have been assigned to select a transformer to supply a peak power of 100 kW to a load that draws peak power only a very small percentage of the time and draws very little power the rest of the time. Two transformers, A and B, are both suitable. While both transformers have the same efficiency at peak load, most of the loss in A is due to core loss, and most of the loss in B is due to the resistances of the coils. From the standpoint of operating costs, which transformer is better? Why?

The path of a magnetic flux in a transformer should have O High resistance O Low reluctance O Low resistance O High reluctance