Use the following situation to answer questions 27-30. The following two circuit
ID: 2029868 • Letter: U
Question
Use the following situation to answer questions 27-30. The following two circuits same 120V power supply. To answer the questions use the following arrangement contain the same 40W and 60W light bulbs, connected in series and in parallel to the C. 40W paralle D. 60W parallel B. 60W series A. 40W series PHY2054 Test II Spring 2013 40W 40W 60vw 60W 27. Rank their brightness from brighter to dimmer. a. A, B, C, and Db. D, C, B, and A C.D, C, A, and B d. D, B, C, and A 28. Rank the currents that are going through the light bulbs from largest to smallest. 29. Rank the voltage across each light balb from highest to lowest 30. Rank their resistance from largest to smallest 31. Charged particles enter a region of uniform magnetic field with a velocity v, the direction of motion of the particles with respect to the magnetie field ranges from 0 to 180. After the particles enter the magnetic field, the possible paths that they could follow is/are(Select all that apply) a. Parabolic path b. Circular path c. Helical (spiral) path d. Straight line motion 32. Which combination of units can be used to express the strength of the magnetic field? (Select all that apply). c. T A s 2Explanation / Answer
For series arrangement:
The resistance of 40 watts: 120^2/ 40= 360 ohms
Resistance of 60 watts: 120^2/ 60 = 240 ohms
I through 40 watts and 60 watts: 120 / (360 + 240) =0.2 A
V across 40 watts= 360 (0.2) = 72 V -----------more glow
V across 60 watts: 240 (0.2) = 48 V ----------less glow
For parallel circuit:
Resistance of 40 watts = 120^2/ 40= 360 ohms
Resistance of 60 watts: 120^2/ 60 = 240 ohms
I through 40 watts bulb, 120 / 360=0.33 A
I through 60 watts bulb, 120/ 240 = 0.5 A
Voltage drop across both bulbs is same= 120 V
Q: 27 brightness
D, C, A , B
Q: 28 Current
ID > IC > I B= IA
Q: 29 Voltage
VC = VD > V A > VB
Q: 30
Ra = Rc> Rb = Rd