what is the highest and lowest total resistance that can be secured by the combination of 4 coils of resistance 4ohm,6ohm,8ohm,12ohm.
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In series Rs = R1+R 2+R3+R4
= 4+6+8+12=30ohm
In parallel 1/Rp = 1/Rp + 1/Rp + 1/Rp + 1/Rp
= 1/4+1/6+1/8+1/12
1/Rp = 6+4+3+2/24
1/Rp = 15/24
Rp = 24/15 = 8/5
In series , resistance is Highest and in parallel resistance is Lowest
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