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प्रश्न
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
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उत्तर
If current I is drawn from the battery, the current through each resistor will also be I.
On applying Ohm's law to the two resistors separately, we further
have
`"V"_1 = "I R"_1`
`"V"_2 = "I R"_2`
`"V" = "V"_1 + "V"_2`
`"IR" = "I R"_1+ "I R"_2`
`"IR" = "I " ["R"_1+ "R"_2]`
`"R" = "R"_1+ "R"_2`
Total Resistance in series R
`"R" = "R"_1+"R"_2+"R"_3`
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संबंधित प्रश्न
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the nature of charge on the sphere? Give reason for your answer.
- Name and state the law which relates the potential difference and current in a conductor.
- What is the necessary condition for a conductor to obey the law named above in part (a) ?
What is ohmic device?
Explain the equivalent resistance of a parallel resistor network.
The unit of specific resistance is ____________.
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
Why should an ammeter have low resistance?
