Advertisements
Advertisements
प्रश्न
Explain the difference:
AC generator and DC generator.
Advertisements
उत्तर
| AC generator | DC generator | |
| i. | It is used to produce alternating current. | It is used to produce direct current. |
| ii. | It has two simple ring-type commutators. | It has a single split-ring commutator. |
| iii. | Frequency of induced current is 50Hz. | Frequency of induced current is 0Hz. |
| iv. | Current changes its directions. | Current flows in same direction. |
APPEARS IN
संबंधित प्रश्न
State the principle of an electric generator.
State whether the following statement is true or false.
An electric motor converts mechanical energy into electrical energy.
Name the device which converts mechanical energy into electric energy.
Name the phenomenon which is made use of in an electric generator.
What is the function of brushes in an electric generator?
What is the major difference between the simple alternator and most practical alternators?
Complete the following sentence:
A generator with commutator produces ............... current.
An electric generator converts:
(a) electrical energy into mechanical energy.
(b) mechanical energy into heat energy.
(c) electrical energy into chemical energy.
(d) mechanical energy into electrical energy.
Name and state the principle of a simple a.c. generator. What is its use?
What energy conversion does take place in a generator when it is in use?
State one advantage of using a.c. over d.c.
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.
A flat coil of wire rotates at a constant speed about an axis perpendicular to a uniform magnetic field. Draw a graph to show how the induced e.m.f. varies relative to the positions of the coil during its one complete rotation. At what position of the coil, the e.m.f. has the maximum value?
The given figures 1 to 3 show the working of a simple A.C. generator. Study the diagrams and answers of the following questions.
(i) State and explain the principle underlying the working of a simple generator.
(ii) Where is the loop of wire placed?
(iii) What happens when the loop is rotated?
(iv) Indicate the direction of the current flow through the wire for the first half of the turn (in first figure). Name and state the rule used in finding the direction of the current.
(v) Indicate the direction of the current for the case shown in second figure.
(vi) Indicate the direction of current in the outer circuit (i.e., electric bulb) in first and third figure.
(vii) What type of current is shown in the above diagrams? Explain.
A device for producing electric current is ______.
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is withdrawn from inside the coil?
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is held stationary inside the coil?
State one factor that affects the magnitude of induced current in an AC generator.
