2. Individual Whiteboard Problem
Light bulb 1 has a resistance of 10 ohms, Light bulb 2 has a resistance of 15 ohms, and their battery is 10 V. Light bulb 3 has a resistance of 5 ohms with a 6 V battery. Which bulb is the brightest? 3
+ - 1 2
3: 7.2
1: 1.6
2: 2.4

3. How many coulombs pass by each of the following points every second?
10 ohms B
30 ohms 1 A 2
80 V C
How many coulombs pass by each of the following points every second?
A___ B___C___
How many joules does each light bulb take from each coulomb? 1_____ 2_____
How many joules does each coulomb carry at the following points?
d) How many joules are emitted by each light bulb every second? 1_____ 2______
e) If we doubled the voltage of the battery, what happens to the number of joule
emitted by each light bulb every second?

4. Light bulb 1 has 1/3 of the current flowing through light bulb 3.
Circuit A
Circuit B
10 ohms 3
10 ohms B
? ohms 1 2 E D A
36 V C
90 V
a) How many coulombs pass by each of the following points every second?
A___ B___C___ D___E___
b) What is the resistance of light bulb 2?
c) How many joules does each light bulb take from each coulomb?
1_____ 2_____3_____
d) How many joules does each coulomb carry at the following points?
e) How many joules are emitted by each light bulb every second?
1_____ 2_____ 3_____

5. Individual Whiteboard Problem
Light bulb 1 has a resistance of 10 ohms, Light bulb 2 has a resistance of 15 ohms, and their battery is 10 V. Light bulb 3 has a resistance of 5 ohms with a 6 V battery. Which bulb is the brightest? Light Bulb 3 (7.2 J/s) 3
+ - 1 2
3: 7.2
1: 1.6
2: 2.4

6. How many coulombs pass by each of the following points every second?
10 ohms B
30 ohms 1 A 2
80 V C
How many coulombs pass by each of the following points every second?
A_2__ B_2__C_2__
How many joules does each light bulb take from each coulomb? 1__20_ 2__60_
How many joules does each coulomb carry at the following points?
A_80_ B_ 60__C_0__
d) How many joules are emitted by each light bulb every second? 1__40_ 2__120____
e) If we doubled the voltage of the battery, what happens to the number of joule
emitted by each light bulb every second? Quadruple

7. Light bulb 1 has 1/3 of the current flowing through light bulb 3.
Circuit A
Circuit B
10 ohms 3
10 ohms B
? ohms 1 2 E D A
36 V C
90 V
a) How many coulombs pass by each of the following points every second?
A__3_ B_3__C__3_ D_9__E_9__
b) What is the resistance of light bulb 2? 2 ohms
c) How many joules does each light bulb take from each coulomb?
1__30___ 2___6__3___90__
d) How many joules does each coulomb carry at the following points?
A__36_ B__6_C__0_ D__0_E__90_
e) How many joules are emitted by each light bulb every second?
1___90__ 2__18___ 3_810____