Kirchhoff's rules for circuits

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   5 A flows into a junction. One wire carries 2 A out. How much current does the only other wire carry out, to 0.01 A, Ari?

   3 A
2. 2.

   1.2 A flows into a junction. One wire carries 0.5 A out. How much current does the only other wire carry out, to 0.01 A, Bo?

   0.7 A
3. 3.

   8 A flows into a junction. One wire carries 3.5 A out. How much current does the only other wire carry out, to 0.01 A, Kira?

   4.5 A
4. 4.

   At junction P in the schematic, how much current leaves on wire 3, Jun?

   • 1.5 A
   • 2.5 A
   • 5.5 A
5. 5.

   What does Kirchhoff's junction rule say, by Luz's reading (OpenStax)?

   • Current into a junction is lost as heat
   • Current into a junction equals current out
   • Current out of a junction is double the current in
6. 6.

   What does Kirchhoff's loop rule say, by Noah's reading (OpenStax)?

   • Each resistor in the loop drops the full battery voltage
   • The voltage changes around a closed loop add to zero
   • The current changes around a loop add to zero
7. 7.

   Going around a loop in the current's direction, what is the voltage change across a resistor, Ren?

   • A drop of IR
   • No change, since current flows through it
   • A rise of IR

8. Read this first

   Use this

   Circuit schematic (example data):

10. 8.

    In the schematic, which point is a junction, Tala?

    • The battery's + end, where current starts
    • Point A, where the current splits
    • The middle of the 3 Ω resistor
11. 9.

    In the schematic, why does ammeter A0 read 3 A, Zee?

    Use the picture in question 8.

    • The battery makes 3 A no matter what is connected
    • It carries both branch currents: 2 A + 1 A
    • It carries the average of the branches
12. 10.

    In the schematic, what is the voltage across the 6 Ω branch, Esme?

    Use the picture in question 8.

    • 6 V, the same as the 3 Ω branch
    • 12 V, twice the battery voltage
    • 3 V, half of the battery voltage