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प्रश्न
State expression for Resistance connected in series.
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उत्तर
R = r1 + r2 + r3, resistances in series.
संबंधित प्रश्न
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
Find the equivalent resistance between points A and B.
(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?
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
Name the material which is used for making the heating element of an electric iron.
Give the law of combination of resistances in series.
To increase the effective resistance in a circuit, the resistors are connected in _______________ .
What material is used for making wire to prepare heating coils? Give a reason.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
