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प्रश्न
What is emf?
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उत्तर
When no current is drawn from the cell, i.e., when the cell is in open circuit, the potential difference between the terminals of the cell is called its electromotive force (or e.m.f.).
संबंधित प्रश्न
Define the unit of current.
A student made an electric circuit shown here to measure the current through two lamps.
Are the lamps in series or parallel?
(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram.
What happens to the other bulbs in a series circuit if one bulb blows off?
Which effect of current is utilised in the working of an electric fuse?
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
Find the effective resistance in the following circuit diagrams (Fig.):
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :
The total current taken from the supply
- What is meant by electric current?
- Name and define its unit.
- Which instrument is used to measure the electric current? How should it be connected in a circuit?
