Two lightbulbs both operate on separate 120 V sources. One has a power of 40 W and the other is 80 W. Which of the following is true? o a. they have the same current flowing o b. the 80 w bulb has more current flowing O c. the 40 W bulb has a lower resistance o d. they have the same resistance

. A resistor operated at 120 V DC is rated at 1.40 kW. a) What is the normal operating current through the resistor? b) What is the resistance of the resistor?

23. Three resistors, rated at 100.0, 200.0, and 300.0, are connected in parallel to a 12.0 V battery. What is the total dissipated power of the three resistors? A.0.24 W B.11.44W C.2.64 W D. 12.0 W

12. 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…

A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 8 w. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is W. b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire (diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission…

A certain person will experience a mild electric shock when the current between two fingers exceeds 72uA. If. The resistance between their thumb and index finger is measured to be 215ohms, how much voltage can be applied before they feel a mild shock? a. 15.5uV b. 33.5uV c. 29.9uV d. 29.9V e.15.5V