A 6.0V battery, a resistor of 30Ω, a key, an ammeter (ideal) and a voltmeter of resistance 10kΩ are available in the laboratory.
(i) For arrangement (a) calculate the current that should be recorded by the ammeter.
(ii) For arrangement (b) calculate the current that now flows in the circuit.
(iii) Determine the percentage error introduced in the current measurement because of the incorrect connection.
(iv) State two practical precautions that a student should follow to avoid such errors while setting up the circuit.