Download Practice Electricity Questions

Practice Electricity Questions
You may want to color code the circuits to get a better idea of what’s going on…
Probs 1-7. Consider the two circuits with identical resistors R.
Circuit 1
Circuit 2
R
R
9V
R
9V
R
True/False
1. _____ All 4 resistors will have the same current through each of them.
2. _____The battery in circuit 2 will have more current through it than the battery in circuit 1.
3. _____The resistors in circuit 1 are in parallel with each other and the battery.
4. _____ In circuit 2 the current through the battery is twice the current though each resistor.
Now let the resistors be light bulbs:
5. _____If one of the bulbs in circuit 1 is unscrewed (connection is broken), the other will go out.
6. _____If the bottom resistor in circuit 2 has a larger resistance than the resistor above it, then
the voltage across the bottom resistor would be larger than the voltage across the top resistor.
7. _____The light bulbs in circuit 1 will be brighter than in circuit 2.
1
8. Complete the table.
V
R1
1
I
5V
2A
2
9V
R
4
3
R2
R3
9. Complete the table, and answer the question.
V
1
I
R
18 V
R1
12 
2
3
36 V
R2
R3
R4
4
5
R5
3A
12 V
6A
Questions:
1. Which resistors in the circuit are in parallel?
2. Which resistors in the circuit are in series?
2
10. Complete the table and answer the question.
V
I
2
1
R1
R
2
6A
R2
3
10 V
4
4
24 V
R3
R4
5
1A
R5
Questions:
1. Which resistors, if any, are in parallel?
2. What would happen to the current through R2 if you were to remove R5, that is,
break the circuit there? Find the new current using the resistances from the table
above.
3