Study the statements given below and answer the questions that follow.
(i) State the desirable value of resistance of an ideal ammeter.
(ii) Explain with reason why an ammeter is always connected in series with the circuit element through which the current is to be measured.
(iii) The resistance of an ammeter used in a laboratory is accidentally increased due to damage. Predict qualitatively how this will affect the current in the circuit and the reading shown by the ammeter when it is connected in the usual series manner. Give reasons for your answer.
(iv) A student mistakenly connects the same ammeter across a resistor instead of in series with it. Explain what is likely to happen to (a) the ammeter and (b) the rest of the circuit. Support your answer with appropriate reasoning.