Advertisements
Advertisements
Question
State one advantage of using a.c. over d.c.
Advertisements
Solution
The voltage of a.c. can be stepped up by the use of step-up transformer at the power generating station before transmitting it over long distances. It reduces the loss of electrical energy as heat in the transmission line wires. On the other hand, if d.c. is generated at the power generating station, its voltage cannot be increased for transmission, and so due to passage of high current in the transmission line wires, there will be a huge loss of electrical energy as heat in the line wires.
RELATED QUESTIONS
Name some sources of direct current.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each______.
The device used for producing electric current is called a ______.
What is the major difference between the simple alternator and most practical alternators?
Draw the labelled diagram of an A.C. generator. With the help of this diagram, explain the construction and working of an A.C. generator.
A d.c. generator is based on the principle of:
(a) electrochemical induction
(b) electromagnetic induction
(c) magnetic effect of current
(d) heating effect of current
State whether the following statement are true of false:
A miniature circuit breaker (MCB) works on the heating effect of current.
Draw a labelled diagram of a simple a.c. generator.
Draw and label the diagram of an AC generator.
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is held stationary inside the coil?
