English
Karnataka Board PUCPUC Science 2nd PUC Class 12

Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (11/5) Ω?

Advertisements
Advertisements

Question

Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of  (11/5) Ω?

Numerical
Advertisements

Solution

Equivalent resistance, R' = `11/5` Ω

Consider the following combination of the resistors.

Equivalent resistance of the circuit is given by,

R' = `(2 xx 3)/(2 + 3) + 1`

= `6/5 + 1`

= `11/5` Ω

shaalaa.com
  Is there an error in this question or solution?
Chapter 3: Current Electricity - Exercise [Page 129]

APPEARS IN

NCERT Physics Part I and II [English] Class 12
Chapter 3 Current Electricity
Exercise | Q 3.20 (b) (ii) | Page 129

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

State the two Kirchhoff’s rules used in electric networks. How are there rules justified?


Determine the current in each branch of the network shown in figure.


Given n resistors each of resistance R, how will you combine them to get the (i) maximum (ii) minimum effective resistance? What is the ratio of the maximum to minimum resistance?


The current is drawn from a cell of emf E and internal resistance r connected to the network of resistors each of resistance r as shown in the figure. Obtain the expression for

  1. the current draw from the cell and
  2. the power consumed in the network.


Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (11/3) Ω?


Determine the equivalent resistance of networks shown in Fig.


State Kirchhoff's rules for an electric network. Using Kirchhoff's rules, obtain the balance condition in terms of the resistances of four arms of Wheatstone bridge.


Twelve wires, each of equal resistance r, are joined to form a cube, as shown in the figure. Find the equivalent resistance between the diagonally-opposite points a and f.


An infinite ladder is constructed with 1 Ω and 2 Ω resistors, as shown in the figure. (a) Find the effective resistance between the points A and B. (b) Find the current that passes through the 2 Ω resistor nearest to the battery.


Consider the potentiometer circuit as arranged in the figure. The potentiometer wire is 600 cm long. (a) At what distance from the point A should the  jockey touch the wire to get zero deflection in the galvanometer? (b) If the jockey touches the wire at a distance of 560 cm from A, what will be the current in the galvanometer?


On which conservation principle is Kirchoff's Second Law of electrical networks based?


Explain the determination of unknown resistance using meter bridge.


Lightning is a very good example of a natural current. In typical lightning, there is 109 J energy transfer across the potential difference of 5 × 107 V during a time interval of 0.2 s. Using this information, estimate the following quantities:

  1. the total amount of charge transferred between cloud and ground
  2. the current in the lightning bolt
  3. the power delivered in 0.2 s.


While measuring the length of the rod by vernier callipers, the reading on the main scale is 6.4 cm and the eight divisions on vernier is in line with marking on the main scale division. If the least count of callipers is 0.01 and zero error - 0.04 cm, the length of the rod is ______.


Two cell of 1.25 V and 0.75 V are connected parallel. The effective voltage will be:-


The e.m.f of The battery in a thermocouple is doubled. The rate of heat generated at one of the junction will.


Kirchhoff s second law is based on the law of conservation of ______


Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio `i_3/i_1` of currents in terms of resistances used in the circuit is:


In a meter bridge the point D is a neutral point (Figure).

  1. The meter bridge can have no other neutral point for this set of resistances.
  2. When the jockey contacts a point on meter wire left of D, current flows to B from the wire.
  3. When the jockey contacts a point on the meter wire to the right of D, current flows from B to the wire through galvanometer.
  4. When R is increased, the neutral point shifts to left.

Two cells of voltage 10V and 2V and internal resistances 10Ω and 5Ω respectively, are connected in parallel with the positive end of 10V battery connected to negative pole of 2V battery (Figure). Find the effective voltage and effective resistance of the combination.


State the two Kirchhoff’s rules used in the analysis of electric circuits and explain them.


A 6-volt battery is connected to the terminals of a three-metre-long wire of uniform thickness and resistance of 100 ohms. The difference of potential between two points on the wire separated by a distance of 50 cm will be ______.


In the circuit shown in Figure below, E1 and E2 are batteries having emfs of 25V and 26V. They have an internal resistance of 1 Ω and 5 Ω respectively. Applying Kirchhoff’s laws of electrical networks, calculate the currents I1 and I2.


What is Kirchhoff's Current Law also called?


What is Kirchhoff's Voltage Law also called?


Which pair of equations expresses the loop relationship for cells and resistors?


What is a junction or node?


What is a branch?


Which term is defined as the rate of flow of charge through a conductor?


What is potential difference?


Why must the amount of charge entering a junction per second equal the amount leaving when current is steady?


After a charge completes one full loop and returns to its starting point, what is the net change in potential?


While moving opposite to the direction of current through a resistor, how is the potential change treated?


At junction P, currents \[0.2\,\mathrm{A}\], \[0.6\,\mathrm{A}\], and \[0.7\,\mathrm{A}\] point towards P, while \[0.4\,\mathrm{A}\], \[0.5\,\mathrm{A}\], and \[I\] point away. What is the unknown current?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×