Advertisements
Advertisements
प्रश्न
Observe the figure and write the answers to the questions asked.
- The construction shown in the figure is of which device?
- Explain the principle on which this device works.
- Write any three uses of this device.
Advertisements
उत्तर
- The figure shows the construction of an electric generator.
- Principle of electric generator: Electric generator works on the principle of electromagnetic induction. When the coil of the electric generator rotates in a magnetic field, the magnetic field induces a current in this coil. This induced current then flows into the circuit connected to the coil.
- Uses of electric generator are-
- Providing backup energy for emergencies.
- Powering construction sites.
- Powering nuclear reactor plants.
- Providing backup for hospitals and other office buildings
APPEARS IN
संबंधित प्रश्न
Which sources produce alternating current?
The device used for producing electric current is called a ______.
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.
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
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 wire with a green insulation is usually the live wire.
State whether the following statement are true of false:
A miniature circuit breaker (MCB) works on the heating effect of current.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric Generator (AC)
Explain the difference:
AC generator and DC generator.
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.
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.
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 withdrawn from inside the coil?
State one factor that affects the magnitude of induced current in an AC generator.
