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 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.
What is the difference between electromotive force (emf) and potential difference (pd)?
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.
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.
What do you mean by shunt? Describe its use in converting a galvanometer into an ammeter.