Advertisements
Advertisements
प्रश्न
What is meant by resistance of a conductor ? Define its SI unit.
Advertisements
उत्तर
Resistance is the quality of a conductor that causes it to resist the flow of an electric current through it. It is the proportion of the potential difference between ends to the current flowing. It has a Sl unit of ohm (Ω).
APPEARS IN
संबंधित प्रश्न
Write the formula of resistivity
Find the expression for the resistivity of a material and state the SI unit of resistivity.
Name the law which is illustrated by the above V−I graph.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.
Consider the sacle of voltmeter shown in the diagram and answer the following questions :
(a) What is the least count of the voltmeter?
(b) What is the reading shown by the voltmeter ?
(c) If the voltmeter is connected across a resistor of 20 `Omega` how much current is flowing through the resistor?
What is meant by the drift speed of free electrons?
What is non-ohmic resistor?
State macroscopic form of Ohm’s law.
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
