Understanding Electronics www.
kitronik.
co.
uk Resistors in Series and Parallel
www.
kitronik.
co.
uk Page 1 of 4
100Ω 82Ω 1 Ω
1000Ω 470Ω 22 Ω
27Ω 2200Ω 15 Ω
3300Ω 1500Ω 47 Ω
Kitronik Ltd – How to calculate resistors in series and parallel
Resistors in...
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Understanding Electronics www.
kitronik.
co.
uk Resistors in Series and Parallel
www.
kitronik.
co.
uk Page 1 of 4
100Ω 82Ω 1 Ω
1000Ω 470Ω 22 Ω
27Ω 2200Ω 15 Ω
3300Ω 1500Ω 47 Ω
Kitronik Ltd – How to calculate resistors in series and parallel
Resistors in series
When resistors are connected one after each other this is called connecting in series.
This is shown below.
To calculate the total overall resistance of a number of resistors connected in this way you add up the
individual resistances.
This is gives the following formula:
Rtotal = 1R + 2R + 3R and so on
Example: To calculate the total resistance for these three resistors in series
Rtotal = 1R + 2R + 3R
= 100 Ω + 82 Ω + 1 Ω
= 183 Ω
Task 1: Calculate the total resistance of the following resistor in series
Rtotal = ……………….
.
.
= ……………….
.
.
Rtotal = ……………….
.
.
= ……………….
.
.
Rtotal = ……………….
.
.
= ……………….
.
.
R1 R2 R3
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