Advertisements
Advertisements
प्रश्न
Which coil of a step up transformer is made thicker and why?
Advertisements
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
Derive an expression for e.m.f. and current in terms of turns ratio
How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?
What is the turns ratio i.e., transformer ratio, ns: np, in an ideal transformer which in-creases ac voltage from 220 V to 33000 V?
The power supply to the primary coil of a transformer is 200 W. Find
(i) Current in primary coil if the e.m.f. supply to it is equal to 220V.
(ii) The number of turns in the primary coil is equal to 80 and that in secondary is 800. What is the transformation ratio?
(iii) Name the type of transformer.
(iv) What will be the output voltage?
(v) What is the current in the secondary coil for an ideal transformer?
(vi) What is the output power?
(vii) Is output and input power equal?
(viii) Compare the current flowing in a secondary coil and in a primary coil.
Distinguish between Step up and Step Down Transformer.
Transformer works on ______.
A 200V/120V step-down transformer of 90% efficiency is connected to an induction stove of resistance 40 Ω. Find the current drawn by the primary of the transformer.
Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
- For a given power level, there is a lower current.
- Lower current implies less power loss.
- Transmission lines can be made thinner.
- It is easy to reduce the voltage at the receiving end using step-down transformers.
