Advertisements
Advertisements
Question
State one advantage of using a.c. over d.c.
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.
APPEARS IN
RELATED QUESTIONS
What change should be made in an a.c. generator so that it may become a d.c. generator?
What is the function of brushes in an electric generator?
What determines the frequency of a.c. produced in a generator?
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric Generator (AC)
Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.
Explain the construction and working of an electric generator (AC) with the help of a neat diagram.
State true or false:
The frequency of AC is 50 Hz.
To convert an AC generator into DC 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?
Observe the following diagram and answer the questions.
- Explain the construction of the equipment shown in the figure.
- How is AC generated?
