A student connects a dry cell, a switch and a small bulb in series. To measure the potential difference across the bulb, the student places a voltmeter in series with the bulb. Soon after closing the switch, the bulb does not glow even though the cell is new.
(i) Identify the mistake in the student’s circuit connection.
(ii) Explain in detail why placing the voltmeter in series prevents the bulb from glowing.
(iii) Describe and justify the correct way in which the voltmeter should be connected so that the bulb lights up and the potential difference across it can be read accurately.