A circuit is shown in below figure

(a)Find the current in the 3Ω,4Ω,2 Ω

(b) What is the PD across 4 Ω resistors

Solution

Three resistors are joined to form a triangle DEF such that DE=1 Ω, EF=2 Ω and FD=3 Ω.A battery of EMF 2 V and internal resistance 1 Ω is connected to points FD

(a)Find the current flowing in DF and DE side

(b)Find the Potential difference at the battery terminals

(c)Find the Potential difference along the DE arm

Solution

A galvanometer together with a resistance 2 Ω is series is connected across two identical batteries each of 1.5 V.When the batteries are connected in series ,the galvanometer records a current of 1 A .When the batteries are connected in parallel, the current is .6 A.

(a)Find the internal resistance of the battery

(b) Find the resistance of the Galvanometer

Solution

A battery of EMF 10V is connected with three resistors A, B, C having resistance 1, 2, 3 ohms respectively in series. The voltage across the resistor B is measured by a voltmeter whose resistance is 10 ohm. What is the percentage error?

Solution

Two batteries each of EMF E and internal resistance r are connected in parallel. If we take current from the combination in an external resistance R,

(a) Find the power dissipated in the resistance R

(b) What value of R maximum power will be obtained?

(c) What is the value of maximum power?

Solution

An electrical circuit is shown in the below figure. The internal resistance of the cells is negligible. Find the current in the each resistor

Solution

The potential difference across a cell is 1.8 V when a current of .5 A is drawn from it. The PD falls to 1.6 V volt when a current of 1.0 A is drawn .Find the EMF and internal resistance of the cell

Solution

What is the resistance of a 1000W 120 V toaster?

Solution

A 600 W heater is used to heat .26 kg of water from 293K to 373 K.What is minimum time in which this can be done?

Specific heat of water=4.184 KJ/kg.K

Solution

- Introduction
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- ElectroMotive Force(emf)
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- Internal Resistance of Battery (or cell)
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- Electric Energy and Power
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- Kirchoff's Rules
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- The junction Rule (or point rule)
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- The Loop Rule (or Kirchoff's Voltage Law)
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- Grouping of the cell's
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- Meterbridge (slide wire bridge)
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- Potentiometer
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- Comparison of EMF's of two cells using potentiometer
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- Determination of internal resistance of the cell

Class 12 Maths Class 12 Physics

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