Question

Deduce the expression for equivalent resistance of the parallel combination of three resistors R1,R2,R3.

Answer 1

1/R = 1/R1 + 1/R2 + 1/R3

Answer 2

• when R1, R2 and R3 are parallel so we know the
• 1/r=1/R1+1/R2+1/R3