Physics
How do the input and output powers in a transformer compare. State the assumption made.
Electro-Magnetism
31 Likes
Answer
For an ideal transformer, when there is no energy loss, the output power will be equal to the input power. i.e., power in secondary coil = power in primary coil or EsIs = EpIp
Assumption made is that the resistance is negligible and there is no energy loss.
Answered By
18 Likes
Related Questions
The diagram below shows a magnetic needle kept just below the conductor AB which is kept in North South direction.
(i) In which direction does the needle deflect when the key is closed ?
(ii) Why is the deflection produced?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.
The diagram in figure shows the core of a transformer and it's input and output connections.
(a) State the material used for the core and describe it's structure.
(b) Complete the diagram of the transformer and connections by labelling all parts joined by you.
(c) Name the transformer : step up or step down.
(a) Complete the following diagram in figure of a transformer and name the parts labelled A and B.
(b) Name the part you have drawn to complete the diagram in part (a)
(c) What is the material of the part named above ?
(d) Is this transformer a step-up or stepdown ? Give reason.
Draw a labelled diagram of a device you would use to transform 220 V a.c. to 15 V a.c. Name the device and explain how does it work. Give it's two uses.