Advertisements
Advertisements
Question
Name the material which is the best conductor of electricity.
Advertisements
Solution
Silver is the best conductor of electricity.
APPEARS IN
RELATED QUESTIONS
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
How does the presence of impurities in a metal affect its resistance?
Give one example to show how the resistance depends on the nature of material of the conductor.
In series combination of resistances ______.
Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :
- the effective resistance of the circuit.
- the reading of ammeter.
What do you mean by power rating of an electrical appliance? How do you use it to calculate
(a) the resistance of the appliance and
(b) the safe limit of the current in it, while in use?
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
State expression for Resistance connected in parallel.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
What is the equivalent resistance between the points X and Y for the given network?
Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
What is the maximum resistance which can be made using five resistors each of `1/5` W?
Consider the following combinations of resistors:
The combinations having equivalent resistance 1 Q is/are ______.
