Which of the following is the energy consumed by a 6 lightbulb when it is wired to a 9 V battery for 20 seconds? a. 270 b. 240 С. 225 d. 180

37. BIO Figure P18.37 shows a simplified model of a cardiac defibrillator, a device used to resuscitate patients in ventricular fibrillation. When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Ruorso , allowing the heart's normal rhythm to be reestablished. a. If the capacitor is initially uncharged with C = 8.00 µF and ɛ = 1250 V, find the value of R required to charge the capacitor to a voltage of 775 V in 1.50 s. b. If the capacitor is then discharged across the patient's torso with Rorso = 1250 N, calculate the voltage across the capacitor after 5.00 ms. Figure P18.37 R C Rtorso + Answer

Which of the following is the energy consumed by a 16 Ω lightbulb when it is wired to a 12 V battery for 25 seconds? a. 225 b. 270 c. 240 d. 180

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…