1. Whiteboarding! Before the quiz let’s try some tricky circuit questions Grab a whiteboard, pens and some colleagues (max 3)

2. Question 1: For the circuit to the right: a.Find the equivalent resistance of the entire circuit b.The current at the point marked I

3. Question 1: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit - 167 kΩ b.The current at the point marked I

4. Question 1: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit - 167 kΩ b.The current at the point marked I - 0.48 mA

5. Question 2: For the circuit to the right: a.Find the equivalent resistance of the entire circuit b.The current at the point marked I

6. Question 2: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit - 77 Ω b.The current at the point marked I

7. Question 2: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit - 77 Ω b.The current at the point marked I – 0.13 A

8. Question 3: For the circuit to the right: a.Find the equivalent resistance of the entire circuit b.The current at the point marked I

9. Question 3: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit – 314 Ω b.The current at the point marked I –

10. Question 3: ANSWERS For the circuit to the right: a.Find the equivalent resistance of the entire circuit – 314 Ω b.The current at the point marked I – 5.2 mA

11. Question 4: a)What is the equivalent resistance of the entire circuit? b)What current is drawn from the battery? c)What is the current in the 50 Ω resistor? d)What is the voltage across the 22 Ω resistor?

12. Question 4: ANSWERS a)50 Ω b)1.0 A c)0.13 A d)7.3 V

13. Question 4: ANSWERS a)50 Ω

14. Question 4: ANSWERS a)50 Ω b)1.0 A

15. Question 4: ANSWERS a)50 Ω b)1.0 A c)0.13 A

16. Question 4: ANSWERS a)50 Ω b)1.0 A c)0.13 A d)7.3 V

17. Question 5

18. V(V)I(A)R(Ω) 15.02.522.0 28.61.715.0 33.20.814.0 45.30.816.5 56.13.053.0 66.12.032.0 77.65.041.5 826.47.553.5 V t = 40I t = 7.55R t = 5.3

19. Question 6: Twelve identical pieces of resistance wire each of resistance 1.0, are formed into a cubical resistance network, shown in the diagram to the right. If a current of 12 A enters one corner of the cube leaves at the other corner, what is the equivalent resistance of the cube between the opposite corner?

20. Question 6: - ANSWER Twelve identical pieces of resistance wire each of resistance 1.0 Ω, are formed into a cubical resistance network, shown in the diagram to the right. If a current of 12 A enters one corner of the cube leaves at the other corner, what is the equivalent resistance of the cube between the opposite corner? ANSWER: 0.83 Ω

21. Quiz: Kirchhoff’s Laws Please clear your whiteboards and prepare your group for Quiz 3

22. Notes: EMF and Terminal Voltage Please take out your notes! Last Page… must be a Unit Test coming up… Next Class: Terminal Voltage Lab + Time to Review 2 Classes: Unit Quiz Electric Circuits 3 Classes: Unit Test Electric Circuits