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प्रश्न
Find the equivalent resistance between points A and B
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उत्तर
As shown in the circuit diagram all the 3Ω resistors re connected in parallel.
`1/R_1=1/3+1/3+1/3`
`R_1=1Omega`
Resistors 4Ω and 6Ω are connected in parallel.
`1/R_2=1/4+1/6=5/12`
`R_2=12/5Omega`
Now R1, R2 and 5Ω are connected in series
`R_(AB)=1+12/5+5`
`R_(AB)=42/5`
`R_(AB)=8.4Omega`
संबंधित प्रश्न
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
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 resistance of a pure metal change if its temperature decreases?
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
Give one example to show how the resistance depends on the nature of material of the conductor.
When do you say that the resistors are connected in this way? Draw a circuit diagram.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
Name the material of wire used for making standard resistances. Give a reason.
Two resistors having 2Ω and 3Ω resistance are connected—(i) in series, and (ii) in parallel. Find the equivalent resistance in each case.
