Resisitive load

A 4:1 step down transformer uses a 60Vac source on the primary windings. There is 120mA flowing through the load resisitance on the secondary windings. What is the resisitive load? Is it 125 ohms? 15V/.120=125

What is the output horsepower? Efficiency?

If a fully loaded 440V, three-phase motor draws 12.4 A at 86% power factor (pf). It's speed is 1730 rpm and its torque output to a mechanical load is 29.1 lb-ft x 1.356 = 39.5 Nm. What is the output horsepower? Efficiency?

Bode Plot

How would I sketch a bode plot for the following transfer function: V2/V1=20jf/10,000/(1+jf/10,000)(1+jf/1,000,000)

RL Circuits: Growth and decay of current in inductor

See attached circuit. Note current source is 2A,Resistors are 2 Ohms, Inductor 2H. Assume that the switch has been open for a long time and that it closes at t=0 sec. The switch remains closed thereafter. How do I solve for Vx(t) and Ix(t)?

Magnitude of Impedience

See attached dwg. Can you please show me how to find the magnitude of Z (The impedience "looking in") as a function of frequency from 10Hz to 100KHZ? Note the inductor is 1mH the resistor 100 Ohms and the cap 1uF.