Science > Physics > Current Electricity > Numerical Problems on Internal Resistance of Cell Example 01: A steady P.D. is maintained between the ends of the potentiometer wire. A cell of e.m.f. 1.02 V is on an open circuit when its terminals are in contact with two points on the wire distant 150 cm. When […]
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Numerical Problems on Potential Drop
Science > Physics > Current Electricity > Numerical Problems on Potential Drop In this article, we shall study to solve numerical problems on the calculation of potential drop (potential gradient) on potentiometer wire. Example 01: A potentiometer wire is 10 m long and a P.D. of 6 V is maintained between its ends. Find the […]
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Potentiometer
Science > Physics > Current Electricity > Potentiometer In this article, we shall study the principle, construction, and working of a potentiometer and its uses. Principle of Potentiometer: When a steady current flows through a wire of uniform cross-section the potential difference per unit length of the wire is constant throughout the length of the […]
Science > Physics > Current Electricity > Numerical Problems on Wheatstone’s Metre Bridge 02 Example – 15: In Wheatstone’s metre bridge experiment with unknown resistance X in the left gap and 60 Ω resistance in a right gap null point is obtained at l cm from the left end. If the unknown resistance is shunted by equal resistance, […]
Science > Physics > Current Electricity > Numerical Problems on Wheatstone’s Metre Bridge 01 In this article and the next article, we shall study numerical problems based on Wheatstone’s metre bridge. Example – 01: A resistance of 10 Ω is connected in a left gap of a metre bridge. Two resistors of 20 Ω and 16 Ω are […]
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Kirchhoff’s Laws
Science > Physics > Current Electricity > Kirchhoff’s Laws In this article, we shall study Kirchhoff’s laws, construction, working and uses of Wheatstone’s metre bridge. There are two Kirchhoff’s laws viz: current law or junction law and voltage law or mesh law. Kirchhoff’s Current Law or Kirchhoff’s Junction Law: Statement: In an electric network, the algebraic sum of […]
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Temperature Dependence of Resistance
Science > Physics > Current Electricity > Temperature Dependence of Resistance In this article, we shall study the effect of temperature on the value of resistance and thermistors and their uses. A metallic conductor consists of a large number of free electrons. These electrons are always in a state of random motion. When a potential […]
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Introduction to Current Electricity
Science > Physics > Current Electricity > Introduction In this article, we shall study the concept of current electricity, the resistance, ohm’s law, and the conductance of a conductor. Electric Current Through Conductor: A conductor is made up of very minute particles called atoms. Atoms consist of a positively charged nucleus and negatively charged electrons […]