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
1 000
1 200
Explanation
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solution:
data given
Np = ??
Ns = 1000
Ep = 120v
Es = 1200v
to find N
recall:
Np/Ns = Vp/Vs
Np/1000 = 120/1200
cross and multiply ❌
Np/100 = 120/1200
1200Np = 1000x120
1200Np = 120000
divide both sides by 1200
1200Np/1200 = 120000/1200
Np = 100.
therefore option A is very legit 💯
note the following
Np means.
N: number of turns
P: primary coil
combining it together u get
Np = number of turns is secondary coils
Ns: mean
N: no. of turns
S: secondary coils
that is number of turns of secondary coils.
for Es and Ep
it means
Emf of secondary and primary coil and all of that.
so my bro. and sis. all of una wey dey talk say answer no dey. abeg answer dey ooo na Jamb wey wan humble ur career.
