Two electric circuits $I$ and $II$ are shown in the figure.
$(i)$ Which of the two circuits has more resistance?
$(ii)$ Through which circuit does more current pass?
$(iii)$ In which circuit is the potential difference across each resistor equal?
$(i)$ Which of the two circuits has more resistance?
$(ii)$ Through which circuit does more current pass?
$(iii)$ In which circuit is the potential difference across each resistor equal?
(N/A) $(i)$ The net resistance of a series combination of resistors is greater than the net resistance of a parallel combination of resistors. Therefore,the resistance of circuit $I$ is greater than the resistance of circuit $II$.
$(ii)$ Since current is inversely proportional to resistance for the same potential difference $(I = V/R)$,the current in circuit $II$ is greater than the current in circuit $I$.
$(iii)$ In a parallel circuit,the potential difference across each resistor is equal. Therefore,the potential difference across each resistor in circuit $II$ is equal.
$(ii)$ Since current is inversely proportional to resistance for the same potential difference $(I = V/R)$,the current in circuit $II$ is greater than the current in circuit $I$.
$(iii)$ In a parallel circuit,the potential difference across each resistor is equal. Therefore,the potential difference across each resistor in circuit $II$ is equal.
Explore More
Similar Questions
$(a)$ Resistivity of iron is $10 \times 10^{-8} \; \Omega m$ and of mercury is $94 \times 10^{-8} \; \Omega m$. Which among iron and mercury is a better conductor? Give reason.
$(b)$ Resistivity of a material $A$ is in the range of $10^{10}-10^{14} \; \Omega m$ while that of $B$ is in the range of $10^{-6}-10^{-8} \; \Omega m$. Which of the two will behave as an insulator and why?
$(b)$ Resistivity of a material $A$ is in the range of $10^{10}-10^{14} \; \Omega m$ while that of $B$ is in the range of $10^{-6}-10^{-8} \; \Omega m$. Which of the two will behave as an insulator and why?
Medium
View SolutionIn an electric circuit,state the relationship between the direction of conventional current and the direction of flow of electrons.
Easy
View Solution$(a)$ $A$ Nichrome wire of length $L$ and radius $r$ has a resistance of $10 \, \Omega$. How would the resistance of the wire change when:
$(i)$ only the length of the wire is doubled?
$(ii)$ only the diameter of the wire is doubled? Justify your answer.
$(b)$ Why are the elements of electrical heating devices made up of alloys?
$(i)$ only the length of the wire is doubled?
$(ii)$ only the diameter of the wire is doubled? Justify your answer.
$(b)$ Why are the elements of electrical heating devices made up of alloys?
Medium
View Solution$A$ hot plate of an electric oven connected to a $220 \ V$ line has two resistors $A$ and $B$ each of $22 \ \Omega$ resistance. These resistors may be used separately,in series,or in parallel. Find the current flowing in all the three cases.
Medium
View Solution$(a)$ Give reasons why tungsten is used for making the filament of electric lamps.
$(b)$ Why are the heating elements of electrical appliances made up of an alloy rather than a pure metal?
$(b)$ Why are the heating elements of electrical appliances made up of an alloy rather than a pure metal?
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo