27. Most Christmas tree lights with incandes- cent bulbs are connected in parallel. (a) Describe one advantage of lights connect- ed in parallel. (b) Suppose you connect these lights in series. Will they be brighter or darker? Explain. What modification would make the lights equally bright? Explain.
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- 1. The time constant RC has a unit of second/farad. second/ohm. 1/second. second/watt. none of these 2. Four circuits have the form shown in the diagram below. The capacitor is initially uncharged and the switch S is open. Rank the circuits according to the current just after switch S is closed least to greatest. The values of the emf E, resistance R, and capacitance C for each of the circuits are (attached photo)D43. A coffee-maker (142) and a toaster (192) are connected in parallel to the same 120-V outlet in a kitchen. How much total power is supplied to the two appliances when both are turned on? a. 1.2x105w b. 2.2x105w c. 3.2x105w d. 4.2x105w 4. A 16-N loudspeaker, an 8.0-2 loudspeaker, and a 4.0-N loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers, assuming that they all behave as resistors. а. О.340 b. 0.442 c. 0.542 d. 0.642 5. A 60.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 25 V, what is the resistance R of the resistor? а. 1.0х10'0 b. 2.0x10'n c. 3.0x10'n d. 4.0x10'n
- 2. Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true? A) The current through R equals the current through R1. B) The voltage across R equals the voltage across R1. C) The power given off by R equals the power given off by R1. D) R is less than R1. E) None of the above12. A lightbulb uses 4 A when it is connected across a 120 V source. What is the resistance in the resistane = V Vano -301 210-3012 lightbulb? 13. What is work? the transfer of energy by a force object agit is Displaced acting on by vitve opergy which a body possesses 14. What is kinetic energy? tion 15. What is potential energy? energy that is waiting to be a 16. A boy pushes on a parked car with a force of 111 N. The car does not move. How much work does the boy do on the car? Explain your answer. Work : Owork becasue the car. didn't move 17. In the absence of air resistance, how would the acceleration of a 2.0 kg book and the acceleration of a 3.3 kg rock differ if the objects were dropped from the same height? 18. What are Newton's three laws of motion (summarize them)? ject will not Law I an Change unle torce is acted on gecond low, the force On un object is equal! mass & its accelertion 3 law, when 2 bu interact they apply Forces to each oth 19. If your weight is 777 N, how much…Questions: 8c. Calculate the voltage drop across one of the transmission lines. 8d. Calculate the rate of loss of energy from one of the 3 Ohms transmission lines, giving the units. 8e. Calculate the potential difference V at the receiving end of the transmission lines.
- Three identical light bulbs are connected as shown below along with a battery of emf E and a switch S. The switch is open and all three light bulbs are equally bright. What happens when the switch S is closed? A в C O A. Bulbs A and C continue to glow with the same brightness as before while bulb B goes out. O B. No change. They all continue to glow equally bright as before. O C. Bulbs A and C will get brighter while bulb B goes out. O D. Bulb A gets brighter, bulb C gets dimmer, and bulb B goes out.QUESTION 22 Given two resistors of 70 ohms and 40 ohms connected in series to a DC battery. If the 70-ohm resistor has a current of 3.00 Amperes through it then which of these is the current through the 40-ohm resistor in SI units? a. four sevenths of 3.00 b. one-third c. 3.00What happens to the two identical bulbs A and B con- nected to two 12V batteries, as shown, when the switch is closed? A. B. C. D. A glows, B changes A glows, B stays same A stays same, B changes A stays same, B stays same What happens when the switch is closed if I change the battery on the right to 6V? A. B. C. D. A glows, B changes A glows, B stays same A stays same, B changes A stays same, B stays same 12V 12V fmm A (mm) A B B switch switch ww 12V 6V
- 1F IF 6V 6 V 10 (A) (B) Figure 1:7. In a DC circuit 8.41 x 10 19 electrons travel through a point in the circuit in two seconds. What current is in the circuit? a. 7.43 Amperes b. 5.36 Amperes c. 6.73 Amperes d. 1.10 Amperes e. 8.41 x 1019 Amperes1. The sum of the resistance of resistors in series can sometimes be greater than the individual resistances. True or False 2. In planet mars the acceleration due to gravity there is also 9.81 m/s2. True or False 3. Vectors are quantity that has magnitude and direction. One example of it is density. True or False