Advertisements
Advertisements
प्रश्न
From the following observations taken while determining the resistance of a conductor, draw the current-voltage graph and calculate the resistance of conductor. Is the conductor ohmic?
| Ammeter reading I (in ampere) | Voltmeter reading V (in volt) |
| 0.2 | 0.4 |
| 0.3 | 0.6 |
| 0.5 | 1.0 |
| 0.8 | 1.6 |
| 1.5 | 3.0 |
Advertisements
उत्तर
The current-voltage graph is shown in figure.
Resistance R = `(triangle"V")/(triangle"I")`
`= ((3.0 - 0.6)"V")/((1.5 - 0.3)"A")`
`= (2.4"V")/(1.2"A") = 2 Omega`
The conductor is ohmic.
संबंधित प्रश्न
What do the letters p.d. stand for?
How much work is done when one coulomb charge moves against a potential difference of 1 volt?
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 5 C passes through it?
Keeping the resistance constant, the potential difference applied across the ends of a component is halved. By how much does the current change?
Calculate the power used in the 2 Ω resistor in each of the following circuits: a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
The device used for measuring potential difference is
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation `1/"R" = 1/"r"_1 + 1/"r"_2 + 1/"r"_3`, when joined in parallel.
Find out the following in the electric circuit given in Figure
- Effective resistance of two 8 Ω resistors in the combination
- Current flowing through 4 Ω resistor
- Potential difference across 4 Ω resistance
- Power dissipated in 4 Ω resistor
- Difference in ammeter readings, if any.
What is the measure of the work done on the unit positive charge to bring it to that point against all electrical forces?
