Advertisements
Advertisements
Question
What is the function of a step-up transformer?
Advertisements
Solution
We use a step-up transformer to push up or step up the voltage of a given a.c. source.
RELATED QUESTIONS
Mention various energy losses in transformer device
Which coil of a step up transformer is made thicker and why?
For what purpose are the transformers used? Can they be used with a direct current source?
State the principle of a step-up transformer. Explain, with the help of a labeled diagram, its working ?
Name the principle on which functioning of a transformer depends.
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
A 100% efficient transformer has 100 turns in the primary and 50 turns in its secondary coil. If the current in the secondary coil is 6 A, then the current in the primary coil is ______.
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.
If the secondary coil has a greater number of turns than the primary, ______.
Magnetic flux passing through a coil is initially 4 × 10-4 Wb. It reduces to 10% of its original value in t second. If the emf induced is 0. 72 mV then t in second is ______.
