parrellel resistors
TRANSCRIPT
Parallel resistors:
Parallel resistors:
We use the Formulae
1/RT = 1/R1 + 1/R2 +
1/R3 + ……1/Rn
Example:
20Ω
50Ω
40Ω
Example:
20Ω
50Ω
40Ω
1/RT = 1/R1 + 1/R2 + 1/R3 + ……1/Rn
Example:
20Ω
50Ω
40Ω
1/RT = 1/R1 + 1/R2 + 1/R3 + ……1/Rn1/RT = 1/20Ω + 1/50Ω + 1/40Ω
Example:
20Ω
50Ω
40Ω
1/RT = 1/R1 + 1/R2 + 1/R3 + ……1/Rn1/RT = 1/20Ω + 1/50Ω + 1/40Ω
On calculator use to enter fractionsa b/c
Example:
20Ω
50Ω
40Ω
1/RT = 1/R1 + 1/R2 + 1/R3 + ……1/Rn1/RT = 1/20Ω + 1/50Ω + 1/40Ω
On calculator use to enter fractions
ie: 1 20 1 50 1 40
a b/c
a b/c=
a b/ca b/c+ +
Example:
20Ω
50Ω
40Ω
1/RT = 1/R1 + 1/R2 + 1/R3 + ……1/Rn1/RT = 1/20Ω + 1/50Ω + 1/40Ω
On calculator use to enter fractions
ie: 1 20 1 50 1 40
1/RT = 19/200
a b/c
a b/c=
a b/ca b/c+ +
Example:
20Ω
50Ω
40Ω
1/RT = 19/200=+
Example:
20Ω
50Ω
40Ω
1/RT = 19/200To change back to decimal; =+
a b/c
Example:
20Ω
50Ω
40Ω
1/RT = 19/200To change back to decimal; 1/RT = 0.095
a b/c
Example:
20Ω
50Ω
40Ω
1/RT = 19/200To change back to decimal; 1/RT = 0.095 To get inverse
=+
a b/c
X-1
Example:
20Ω
50Ω
40Ω
1/RT = 19/200To change back to decimal; 1/RT = 0.095 To get inverse
RT = 10.52Ω=+
a b/c
X-1
Example:
20Ω
50Ω
40Ω
1/RT = 19/200To change back to decimal; 1/RT = 0.095 To get inverse
RT = 10.52ΩNote your answer should always be smaller than the smallest resistor=+
a b/c
X-1