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प्रश्न
Give the law of combination of resistances in series.
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उत्तर
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संबंधित प्रश्न
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
Complete the following :-
(a)
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.
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?
How does the presence of impurities in a metal affect its resistance?
What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?
When do you say that the resistors are connected in this way? Draw a circuit diagram.
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
State expression for Resistance connected in parallel.
Write an expression for calculating electrical power in terms of current and resistance.
Calculate the equivalent resistance between P and Q from the following diagram:
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.
What is the equivalent resistance between the points X and Y for the given network?
Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
