Series and parallel circuits

Answer Key - Grade 11 Science Worksheet - Challenge Me

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

1. 1.

   A 12 V battery feeds a 1 Ω resistor in series with a parallel pair of 6 Ω and 3 Ω. What current leaves the battery, Ari?

   4 A
2. 2.

   A 9 V battery feeds a 1.5 Ω resistor in series with a parallel pair of 4 Ω and 4 Ω. What current leaves the battery, Bo?

   2.57 A
3. 3.

   A kit has only 8 Ω resistors. How can it make 4 Ω, Jun?

   • Two 8 Ω resistors in series
   • Two 8 Ω resistors in parallel
   • Half of one resistor
4. 4.

   How can 4 Ω resistors be joined to make 12 Ω, Kira?

   • Two in parallel
   • Three in parallel
   • Three in series
5. 5.

   Five 30 Ω resistors are joined in parallel. What is their combined resistance, Luz?

   • 6 Ω
   • 30 Ω
   • 150 Ω
6. 6.

   Milo says adding more lamps in parallel to one battery makes the total resistance go up. Agree or disagree?

   • Agree: more lamps mean more resistance
   • Disagree: it goes down
   • Agree: parallel resistances add
7. 7.

   Noah says a 6 Ω and a 3 Ω resistor in parallel make more than 6 Ω. Agree or disagree?

   • Agree: they make 9 Ω
   • Disagree: they make 2 Ω
   • Agree: parallel doubles the biggest
8. 8.

   Pia says the first bulb in a series string gets more current than the last. Agree or disagree?

   • Agree: the current gets used up along the way
   • Agree: the first bulb is nearest the battery
   • Disagree: they all get the same current
9. 9.

   2 A flows into a junction and splits into two branches. One branch carries 0.5 A. What does the other carry, Ren?

   • 1.5 A
   • 1 A
   • 2.5 A
10. 10.

    Why must the current into a junction equal the current out, Zee?

    • Wires store extra charge
    • Charge isn't lost or made there
    • Junctions speed up current