Question

Resistor of 20ohm,20ohm and 30ohm are connected in parallel. What resistance must be added in series with the combination to obtain a total resistance of 10ohm

Answer 1

Answer:

2.5 ohms

Explanation:

1/R= 1/r1+1/r2+….

1/R=1/20+1/20 +1/30

R=7.5 ohms. Add 2.5 ohms in series to make 10 ohms