In the circuit shown below, calculate the net resistance of the circuit.
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The 20 and 5 are in series
hence their net resistance = 20+5 = 25
Similarly
10 and 15 are in series
hence their net resistance is = 10+15 = 25
The combination of both these are in parallel
hence their net resistance is = 25×25/50 = 12.5
Therefore, the net resistance of the circuit is 12.5 ohm
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1/Rp = 1/R1 + 1/R2 + 1/R3 + 1/R4
= 1/10+1/15+1/20+1/5 = 6/60+4/60+3/60+12/60
= 25/60= 5/12
Rp= 12/5 = 2.4 ohms
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