The power output, Pout, of an ideal step-up transformer that receives power input, Pin, and which has N1 turns in the primary and N2 turns in the secondary coil is given by
A.
B.
Pin.C.
Pin.D.
Pin.E.
Pin.Answer: A
You might also like to view...
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
A. E0. B. 1.5E0. C. 1.7E0. D. 2.4E0. E. 2.9E0.
At 96° F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90 % when the temperature is 96°F, the humidity is
a. 10 %. b. 0.9. c. 0.004 kg/m3. d. 0.036 kg/m3. e. 0.04 kg/m3.
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity. B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity. C) The average speed is always less than or equal to the magnitude of the average velocity. D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity. E) The average speed is always one-half the magnitude of the average velocity.
How high will the pendulum bob swing in this figure?
a. To the height of the pencil's point. b. To the maximum height of the bob without the pencil, as shown by the left-most position in the figure. c. Roughly half the height described in choice b. d. Midway between a. and b. e. To the height of the pencil eraser.