Question & Answers
What is the difference between resistance and resistivity?
Distinguish between resistance and resistivity. Derive an expression for the effective resistance of a number of resistors connected in series and parallel.
Explain the theory of series and parallel combinations in an electric circuit.
Explain the theory of a) series and b) parallel combinations of resistance in an electric circuit.
Define emf, terminal potential difference, and internal resistance. Derive the relation between them for the circuit drawing current.
Define emf, terminal potential difference, and internal resistance. Derive the relation between them for the circuit drawing current.
What is the difference between electromotive force (emf) and potential difference (pd)?
What is the difference between electromotive force (emf) and potential difference (pd)?
Define galvanometer. Why should the resistance of a voltmeter be high?
What is galvanometer? How can you convert it into a voltmeter? Why should the resistance of a voltmeter be high?
State and explain Joule’s law of heating. Deduce an expression for heat developed in a conductor due to the passage of an electric current.
State and explain Joule's law of heating. Deduce an expression for heat developed in a conductor due to the passage of an electric current.
How is the current established in a conductor when it is connected across a source of emf?
Discuss how the current is established in a conductor when it is connected across a source of emf. Derive the relation J = nev, where the symbols have their usual meaning.
State Joule’s law of heating and verify it experimentally.
State Joule's law of heating and verify it experimentally.
How is a shunt used to convert a galvanometer into an ammeter?
What do you mean by shunt? Describe its use in converting a galvanometer into an ammeter.