Series and parallel circuits

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   Resistors of 6 Ω and 3 Ω are joined in parallel. What is their combined resistance, Ari?

   2 Ω
2. 2.

   Resistors of 12 Ω and 4 Ω are joined in parallel. What is their combined resistance, Bo?

   3 Ω
3. 3.

   Resistors of 20 Ω and 30 Ω are joined in parallel. What is their combined resistance, Esme?

   12 Ω

4. 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

5. 4.

   Using the table, what is branch Z's resistance, Kira?

   • 30 Ω
   • 2 Ω
   • 1.2 Ω
6. 5.

   Using the table, what is the combined resistance of the three branches, Luz?

   • 6 Ω
   • 62 Ω
   • 20 Ω
7. 6.

   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. 7.

   A resistor is added in series with a bulb on the same battery. What happens to the bulb, Pia?

   • It gets brighter
   • It gets dimmer
   • It stays the same
9. 8.

   A 1000 Ω and a 2000 Ω resistor are in series on a 9 V battery. What voltage is across each, Ren?

   • 6 V and 3 V
   • 4.5 V each
   • 3 V and 6 V
10. 9.

    In a series pair, which resistor has more voltage across it, Tala?

    • They share it equally
    • The one with less resistance
    • The one with more resistance
11. 10.

    Two equal resistors are in series on a 6 V battery. What voltage is across each, Zee?

    • 12 V
    • 3 V
    • 6 V