Author Question: A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil. If the current in ... (Read 99 times)

segrsyd · **on:** Jul 28, 2018

A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil. If the current in the secondary is 3.00 A, what is the primary current?
a. 6.00 A
c. 48.0 A
b. 0.750 A
d. 12.0 A

Question 2

A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10-12 W/m2)
a. 78.3 dB
c. 92.8 dB
b. 88.0 dB
d. 95.0 dB