Grade 11 · Science · Physics

11th grade Series and parallel circuits worksheet

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Series and parallel circuits

Grade 11 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Resistors of 6 Ω and 3 Ω are joined in parallel. What is their combined resistance, Ari?
Resistors of 12 Ω and 4 Ω are joined in parallel. What is their combined resistance, Bo?
Resistors of 20 Ω and 30 Ω are joined in parallel. What is their combined resistance, Esme?
Read this first
Three parallel branches on a 6 V battery (example data)
Branch Current (A)
X 0.5
Y 0.3
Z 0.2
4.
Using the table, what is branch Z's resistance, Kira?
- 2 Ω
- 30 Ω
- 1.2 Ω
5.
Using the table, what is the combined resistance of the three branches, Luz?
- 6 Ω
- 62 Ω
- 20 Ω
6.
A fourth branch is added in parallel to the same battery. What happens to the total current, Milo?
- It falls, since there is more resistance
- It rises
- It stays the same
7.
A 10 Ω branch is added in parallel to a 10 Ω resistor. What is the new combined resistance, Noah?
- 20 Ω, since the resistances add
- 5 Ω
- 10 Ω
8.
A resistor is added in series with a bulb on the same battery. What happens to the bulb, Pia?
- It gets dimmer
- It gets brighter
- It stays the same
9.
A 1000 Ω and a 2000 Ω resistor are in series on a 9 V battery. What voltage is across each, Ren?
- 4.5 V each
- 6 V and 3 V
- 3 V and 6 V
10.
In a series pair, which resistor has more voltage across it, Tala?
- The one with more resistance
- They share it equally
- The one with less resistance

Series and parallel circuits. Every version has 10 questions, and the answer key prints on the second page.

I can find equivalent resistance: series resistors add, and two in parallel give R₁R₂ ÷ (R₁ + R₂). Equal resistors in parallel give R ÷ n.
I can use the rules: series parts share one current and their voltages add; parallel branches share one voltage and their currents add.
I can solve a series resistor plus a parallel pair, and use junction and loop rules.
I can predict what bulbs do: in series they all go out together; in parallel they stay lit. Adding a parallel branch lowers the total resistance.

Standard: none (TX, FL)

series: Parts joined one after another in a single loop

parallel: Parts on separate branches between the same two points

equivalent resistance: The one resistance that could replace a group of resistors

branch: One path in a parallel circuit

junction: A point where current splits or joins

Your child averaged the resistors. In series, resistances add: R = R₁ + R₂ + R₃.

Your child added parallel resistors. In parallel, the total is less than either branch: R = R₁R₂ ÷ (R₁ + R₂).

Your child treated every resistor as in series. Combine the parallel pair first, then add the series resistor.

What is the most common mistake with series and parallel circuits?

Your child averaged the resistors. In series, resistances add: R = R₁ + R₂ + R₃.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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