The primary coil of a transformer has N turns and is conn...
The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?
120
100
1000
1200
Correct answer is B
For the transformer, V ∝ ∩
=> V s ∝ ∩s; Vp ∝ ʌp
=> Vp/Vv = ∩p/∩s, therefore 120/1200 = ∩p/1000
therefore ∩p * 1200 = 120 * 1000
∩p = 120*1000/1200 = 100
If a reverse-biased voltage is applied across a p-n junction, the depletion layer width is ...
The rising of a liquid in an open and ended glass tube of narrow bore is ...
Which of the following pairs is NOT part of the electromagnetic spectrum? i. Radio waves. ii. Be...
In which of the following states of matter do the molecules vibrate about their mean positions? ...
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)...