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प्रश्न
State one advantage of using a.c. over d.c.
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उत्तर
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.
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संबंधित प्रश्न
Name the device which converts mechanical energy into electric energy.
Complete the following sentence:
A generator with commutator produces ............... current.
State two ways in the which the current alternating current and direct 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
Draw a labelled diagram of a simple a.c. generator.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric Generator (AC)
Draw a neat labeled diagram of an A.C. generator
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.
The part of the AC generator that passes the current from the armature coil to the external circuit is ______.
Draw and label the diagram of an AC generator.
