15) The reading of the ammeter in the opposite circuit is (0.5A) when the switch is closed.

15) The reading of the ammeter in the opposite circuit is (0.5A) when the switch is closed.
a) Calculate the resistance (R)
b) If the switch (K) is closed:
i) Find the reading of the voltmeter
ii) Find the reading of the ammeter
iii) How many resistors of (12Ω) that can be connected in parallel to make the current in the circuit (1.2A)