Advertisements
Advertisements
Question
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Solution
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`
APPEARS IN
RELATED QUESTIONS
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
What is Resistivity?
Write the formula of resistivity
Write the SI unit of resistivity
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.
Tick(✓) the correct choice in the following:
Ohm's law is applicable to
The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.
State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this. relationship.
Explain the equivalent resistance of a series resistor network.
Which of the following is correct for V-I graph of a good conductor?
