# Question

An ac generator supplies 20 A at 440 V to a 10 000-V power line through a step-up transformer that has 150 turns in its primary coil.

(a) If the transformer is efficient (see Exercise 32), how many turns are in the secondary coil?

(b) What is the current in the power line?

(a) If the transformer is efficient (see Exercise 32), how many turns are in the secondary coil?

(b) What is the current in the power line?

## Answer to relevant Questions

The electricity supplied in Exercise 34 is transmitted over a line 80.0 km long with a resistance of 0.80 Ω /km. (a) How many kilowatt-hours are saved in 5.00 h by stepping up the voltage? (b) At $0.15/kWh, how much of a ...The plane of a conductive loop with an area of 0.020 m2 is perpendicular to a uniform magnetic field of 0.30 T. If the field drops to zero in 0.0045 s, what is the magnitude of the average emf induced in the loop? In Fig. 20.34, a metal bar moves at constant velocity in a constant magnetic field. That field is directed into the page. (a) The direction of the induced current through the bar is (1) up, (2) down, (3) there is no ...Assume that a uniform magnetic field exists perpendicular to the plane of this page (into it) and has a strength of 0.150 T. Assume further that this field ends sharply at the paper’s edges. A single circular loop of wire ...If a driven RLC circuit has an inductive reactance of 250 Ω and a capacitive reactance of 150 Ω, is the driving frequency exactly at, above, or below the circuit’s resonant frequency? Explain how you can tell.Post your question

0