Advertisements
Advertisements
Question
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.
Advertisements
Solution 1
For the same change in I, change in V is less for the straight line A than for the straight line B (i.e. the straight line A is less steeper than B). The straight line A represents small resistance, while the straight line B represents more resistance. The equivalent resistance is less in a parallel combination than in a series combination. So, line A represents a parallel combination.
Solution 2
‘A’ shows parallel combination because in case of parallel combination, the resistance is less for their potential is less, currents is more.
APPEARS IN
RELATED QUESTIONS
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Find the equivalent resistance between points A and B.
The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 27 × 10−8 Ωm.
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.
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.
State the effect of rise in temperature on the resistance of semi-conductors.
Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.
The resistance of the hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use?
