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प्रश्न
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
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उत्तर
The reason is that when the cell is being used, there is a drop in potential across the internal resistance of the cell.
संबंधित प्रश्न
Define the unit of current.
In which direction does conventional current flow around a circuit?
Fill in the folloing blank with suitable words:
A current is a flow of ............... .For this to happen there must be a ............... circuit.
Why should the resistance of:
an ammeter be very small?
Consider the circuit given below:
(a) In which circuit are the lamps dimmest?
(b) In which circuit or circuits are the lamps of equal brightness to the lamps in circuit (i)?
(c) Which circuit gives out the maximum light?
Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?
Match the pairs.
| ‘A’ Group | ‘B’ Group |
| 1. Free electrons | a. V/R |
| 2. Current | b. Increases the resistance in the circuit |
| 3. Resistivity | c. Weakly attached |
| 4. Resistances in series | d. VA/LI |
Two resistors of 4 Ω and 6 Ω are connected in parallel. The combination is
connected across a 6 volt battery of negligible resistance. Calculate:
( i) The power supplied by the battery,
(ii) The power dissipated in each resistor.
Find the effective resistance in the following circuit diagrams (Fig.):
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
