Question

What is lowest resistance that can be secured of four coils of resistance 4 ohm , 8ohm, 10 ohm and 12 ohm

Answer 1

1/Rp=1/8+1/10+1/12+1/4

Rp=120/67 ohm

hope it help you

Answer 2

1/4+1/8+1/10/+1/12

30+15+12+10/120=1/R.eq

R.eq=120/67
=1.79ohm