Advertisements
Advertisements
प्रश्न
Which coil of a step up transformer is made thicker and why?
उत्तर
In a step-up transformer, the primary coil is made of thicker wire.
This is because in a step-up transformer the number of turns in the secondary coil is more than the number of turns in the primary coil.
As `E_s/E_p = N_s/N_p > 1` and `E_sI_s = E_pI_p`
`∴ E_s > E_p`
But Is < Ip. i.e more current flows through the primary coil. Therefore, one must use a thicker wire in the primary coil as compared to that in the secondary coil.
APPEARS IN
संबंधित प्रश्न
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
For what purpose are the transformers used? Can they be used with a direct current source?
What is the function of a step-up transformer?
What are step-up and step-down transformers?
Find out the phase relationship between voltage and current in a pure inductive circuit.
The output power in step-up transformer used in practice is ______.
A transformer having efficiency of 80% is working on 200 V and 6 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are ____________.
Read the following paragraph and answer the question:
Long distance power transmissions
The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V are ______.
For an LCR circuit, the power transferred from the driving source to the driven oscillator is P = I2Z cos φ.
- Here, the power factor cos φ ≥ 0, P ≥ 0.
- The driving force can give no energy to the oscillator (P = 0) in some cases.
- The driving force cannot syphon out (P < 0) the energy out of oscillator.
- The driving force can take away energy out of the oscillator.
The self-inductance of a closely wound coil of 200 turns is 10 mH. Determine the value of magnetic flux through the cross-section of the coil when the current passing through the coil is 4 mA.
