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.
RELATED QUESTIONS
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.
If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :
(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω
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 potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
When do you say that the resistors are connected in this way? Draw a circuit diagram.
State expression for Resistance connected in series.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
Consider the following combinations of resistors:
The combinations having equivalent resistance 1 Q is/are ______.
