Advertisements
Advertisements
प्रश्न
A transformer is designed to work from a 240 V a.c. mains and to give a supply of 8 V to ring a house bell. The primary coil has 4800 turns. How many turns will be in the secondary coil?
A transformer is designed to give a supply of 8 V to ring a house-bell from the 240 V a.c. mains. The primary coil has 4800 turns. How many turns will be in the secondary coil?
Advertisements
उत्तर
Input ac voltage Vp = 240 V.
Number of turns in primary coil Np = 4800
No. of turns in secondary coil Ns = ?
Output voltage Vs = 8 V.
We know that
`"V"_"p"/"V"_"s" = "N"_"p"/"N"_"s"`
`"N"_"s" = ("N"_"p" xx "V"_"s")/ "V"_"p"`
= `(4800 xx 8) / 240`
= 160
The number of turns in the secondary coil is 160.
APPEARS IN
संबंधित प्रश्न
Write the function of a transformer.
A transformer converts 240 V AC to 60 V AC. The secondary has 75 turns. The number of turns in primary are _______.
(A) 600
(B) 500
(C) 400
(D) 300
A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 300 turns. Find the number of turns in the secondary to get the power output at 220 V.
How much current is drawn by the primary of a transformer connected to 220 V supply when it delivers power to a 110 V − 550 W refrigerator?
Explain the significance of Lenz’s law to show the conservation of energy in electromagnetic induction.
Draw a labeled diagram of a full wave rectifier circuit. State its working principle. Show the input-output waveforms ?
The input and output voltages of a transformer are 220 V and 44V respectively. Find the current in input circuit if the output current is 2 A.
Give the advantage of AC in long distance power transmission with an illustration.
Find out the phase relationship between voltage and current in a pure inductive circuit.
In an ideal transformer, the turns ratio is \[\frac {N_p}{N_s}\] = \[\frac {1}{2}\]. The ratio Vs : Vp is equal to (the symbols carry their usual meaning) ______.
