Question

Two resistors with resistances 10 ohm and 15 ohm are to be connected to a battery of 12 V so as to obtain :1) minimum current.2) maximum current.   A) How will you connect the resistance in each case .   B) Calculate the strength of total current in the circuit in the 2 cases.

Answer 1

A) 1) Minimum current ---> parallel combination.
Maximum current ----> series combination

B) When in series,
10+15 = 25 ohm
Current = V/R = 12/25 A

When in parallel,
1/10+1/15 = 5/30 ohm = 1/6 ohm
Current = 12x 6 = 72 A