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प्रश्न
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
विकल्प
Three
Four
Five
Two
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उत्तर
Four
Three equal resistances can be connected in four different combinations:
- All three are in parallel.
- Two in parallel and third in series.
- Two in series and third in parallel of both.
- All three are in series.
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संबंधित प्रश्न
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Complete the following :-
(a)
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?
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?
Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :
- the effective resistance of the circuit.
- the reading of ammeter.
Name the material of wire used for making standard resistances. Give a reason.
Why are thick copper wires used as connecting wires?
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
Calculate the equivalent resistance between P and Q from the following diagram:
Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.
