Advertisements
Advertisements
प्रश्न
Choose the correct alternative.
Which of the following is an ohmic conductor?
पर्याय
transistor
vacuum tube
electrolyte
nichrome wire
Advertisements
उत्तर
nichrome wire
APPEARS IN
संबंधित प्रश्न
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
What is an Ohmic resistor?
Write the SI unit of resistivity
An electrical bulb is marked 200V, 100W. Calculate the electrical resistance of its filament. If five such
bulbs are connected in series to a 200V supply, how much current will flow through them?
Find the expression for the resistivity of a material and state the SI unit of resistivity.
Name the unit of electrical resistance and give its symbol.
Name the law which is illustrated by the above V−I graph.
The graph between V and I for a conductor is a straight line passing through the origin.
- Which law is illustrated by such a graph?
- What should remain constant in a statement of this law?
In a conductor 6.25 × `10^16` electrons flow from its end A to B in 2 s. Find the current flowing through the conductor (e = 1.6 × `10^-19` C)
What length of copper wire of resistivity 1.7 × 10-8 Ω m and radius 1 mm is required so that its resistance is 2Ω?
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
In the circuit shown in the figure, find the total resistance of the circuit and the current in the arm AD.

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) ?
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.
SI unit of resistance is:
State Ohm’s law.
Define temperature coefficient of resistance.
Explain the equivalent resistance of a series resistor network.
Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate
- the current drawn from the cell
- current through each resistor
The unit of specific resistance is ____________.
The slope of voltage (V) versus current (I) is called:

The variable resistance is called ____________.
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
The heat produced by a 100 w heater in 2 minute is equal to
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.
A current of 3.2 mA flows through a conductor. If charge on an electron is −1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
