Advertisements
Advertisements
प्रश्न
Illustrate-combination of cells e.g., three cells, in series, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Advertisements
उत्तर
Combination of cells in series:
In this combination, the cells are so connected that the negative terminal of one cell is connected to the positive terminal of the other cell such that in the end one free positive and one free negative terminal are left. These free terminals are connected to the external circuit. If the e.m.f of each cell is E and Y be the internal resistance and I be the current, then e.m.f. of the cell in series = nE (here n = 3)
The total internal resistance = nr
and External resistance = R
∴ Current I in the external circuit `= "Total e.m.f."/"Total resistance of the circuit"`
I = `"nE"/"nr + R"`
If r is very small, then neglecting r, we get I = `"nE"/"R"`
This shows that it is advantageous to connect cells in series to get a large current when their internal resistance is negligible.
APPEARS IN
संबंधित प्रश्न
(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.
(ii) Why do we prefer arrangements of Set B for house circuiting?
How does the resistance of a wire change when:
its length is tripled?
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
Calculate the combined resistance in each case:
The diagram below shows part of a circuit:
If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω
What is the equivalent resistance between A and B in the given circuit (Fig?)
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
