Advertisements
Advertisements
प्रश्न
What do you understand by the resistance of a wire?
उत्तर
The obstruction offered in the flow of electrons (or current) by the material of the wire, is called its resistance.
APPEARS IN
संबंधित प्रश्न
The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below:
| I (amperes) | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| V (volts) | 1.6 | 3.4 | 6.7 | 10.2 | 13.2 |
Plot a graph between V and I and calculate the resistance of that resistor.
Which device is used to measure p.d?
Name the law which relates the current in a conductor to the potential difference across its ends.
Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor?
Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
Explain why potential difference is always less than the e.m.f. of a cell?
A current of 100 mA. flows through a wire. The charge on an electron is 1.6 × 10-19 C. Find the number of electrons passing per second through the cross-section of the conductor.
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2 ) is ______
