An insulation resistance test carried out on five circuits of an electrical installation provided the following results, 50MO, 39MO, 56MO, 83MO and 26MO. Calculate the expected resistance if all of the circuits were to be measured together in parallel
A) 19Mâ„¦
B) 87Mâ„¦
C) 8.77Mâ„¦
D) 8.77mâ„¦

Question

Quizplus · Accepted Answer

When resistors are connected in parallel, the total resistance is calculated using the formula 1/Rtotal = 1/R1 + 1/R2 + ... + 1/Rn. Therefore, the expected resistance when all circuits are measured together in parallel is 1/((1/50)+(1/39)+(1/56)+(1/83)+(1/26)) = 8.77MΩ.

An Insulation Resistance Test Carried Out on Five Circuits of an Electrical