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प्रश्न
Explain the difference:
AC generator and DC generator.
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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. |
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संबंधित प्रश्न
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______.
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is pushed into the coil?
Name the device which converts mechanical energy into electric energy.
Complete the following sentence:
A generator with commutator produces ............... current.
Explain the principle of an electric generator.
Each one of the following changes will increase emf (or voltage) in a simple generator except:
(a) increasing the number of turns in the armature coil
(b) winding the coil on a soft iron armature
(c) increasing the size of the gap in which the armature turns
(d) increasing the speed of rotation
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.
What determines the frequency of a.c. produced in a generator?
In an a.c. generator the speed at which the coil rotates is doubled. How would this affect
- the frequency of output voltage,
- the maximum output voltage is doubled.
State one advantage of using a.c. over d.c.
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.
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.
State true or false:
The frequency of AC is 50 Hz.
A device for producing electric current is ______.
Draw and label the diagram of an AC generator.
Draw a neat diagram of an AC generator and explain its working.
A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:
A: Held stationary
B: Moved away along its axis
C: Moved towards along its axis
D: There will be an induced current in
