Science · Grades 9–12
Resistors in series
The same current passes through ideal series components.
The key idea
The same current passes through ideal series components.
R_total = R₁ + R₂ + …
Worked examples
Three ideal resistors of 4 Ω, 63 Ω and 11 Ω are in series. Find total resistance in Ω.
4 + 63 + 11 = 78
78 Ω
Three ideal resistors of 6 Ω, 72 Ω and 4 Ω are in series. Find total resistance in Ω.
6 + 72 + 4 = 82
82 Ω
Try it yourself
Three ideal resistors of 43 Ω, 77 Ω and 29 Ω are in series. Find total resistance in Ω.
Three ideal resistors of 67 Ω, 33 Ω and 8 Ω are in series. Find total resistance in Ω.
Check your understanding
Answers and marking notes
- 149 Ω
43 + 77 + 29 = 149
- 108 Ω
67 + 33 + 8 = 108
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.