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Write the expression for variation of resistivity with temperature.

Important Questions on Current Electricity

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 22
Define ohm's law. What is the meaning of ohmic conductors?
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 23
What is the meaning of resistance of conductor? Write the factors on which resistance depends.
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 24
State Kirchhoff's junction rule and loop rule.
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 25
State Joule's law of heating effect in conductors.
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 26
What is the source of heat produced in a conductor connected across a chemical cell?
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Why the balance point of meter bridge is preferred to be close to 50 cm ?
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 27
Length of a conductor is increased by 1%. Calculate the percentage change in its resistance at constant volume.
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 28

Calculate resistance across AB of the network shown in figure.

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 29

Two resistances R1 and R2 are connected in parallel. Derive the effective resistance of their parallel connection.
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Two cells of emf E1,E2 and internal resistance r1,r2 respectively are connected in series. Find the equivalent emf of their series connection.