Question

fi What is the resistance of an air gap: -
(ii) Derive an expression for equivalent resistance in the following case.
WR2
R3
R4
R5
RERE, R. RR3, R1
Decide which resistances are in series and parallel and solve for series and then
parallel. Combine both the results to get the equivalent resistance.​

Answer 1

The equivalent resistance is the combination of both series and parallel resistance.

Explanation:

We are given four resistances in series and parallel.

R1, R2, R3, R4

Resistance in series:

R2 and R3 are in series.

R4 and R5 are in series.

Resistance in parallel:

(R2+R3) and (R4+R5) are in parallel.

The equivalent resistance is:

R(eq) =  R1 + R2 + R3 + R4 / (R2+R3) + (R4+R5)  

The equivalent resistance is the combination of both series and parallel resistance.