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The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?
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.
Name the material of wire used for making standard resistances. Give a reason.
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
