Advertisements
Advertisements
Question
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
Solution
The resistance of the rheostat will not change at all as it does not depend on the voltage applied across it.
APPEARS IN
RELATED QUESTIONS
Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
Calculate the combined resistance in each case:
What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?
4 Ω, 8 Ω, 12 Ω, 24 Ω
What is the equivalent resistance between A and B in the given circuit (Fig?)
How does the resistivity of an alloy such as constantace depends on temperature.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
