When applying the loop rule, what do you get when you cross a circuit element that has resistance? A potential increase. A potential decrease. You get either an increase or decrease in potential depending on the direction of the current.
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- 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 + AnswerConsider the circuit below. The battery has emf 80.0 V, R1=40 ohms, R2= 20 ohms and L= 5.0 mH. Initially the switch is open and no currents are flowing. What is the current through the battery immediately after the switch is closed? a) zero b) 1.3 A c) 2.0 AIn the circuit in the following figure the two capacitors are initially charged at 45.0 V. (a) How long after closing the S switch the potential through each capacitor will be reduced to 10.0 V? (b) At that time, what will be the value of the current?
- In the figure below, R₁ = 21.00, R₂ = 12.0 Q, and the ideal battery has emf 8200 V. What is the current at point a if we close the following switches as =18 R₁ R₁ R₁ m Im Im] www R₁ R₂ R₂ (a) only switch S₁ A (b) only switches S₁ and S₂ (c) all three switches AIf you reverse the direction of the voltage across a resistor (i.e., if the left side was 5V higher than the right side, change it so that now the right side is 5V higher than the left side), what will happen to the current running through that resistor? Group of answer choices The current will go to zero. The current will double. The current will also reverse direction. How should you connect voltmeters or ammeters to a device you want to measure the voltage across or current running through (respectively)? Group of answer choices Both voltmeters and ammeters should be connected in series. Voltmeters should be connected in series, while ammeters should be connected in parallel. Voltmeters should be connected in parallel, while ammeters should be connected in series. Both voltmeters and ammeters should be connected in parallel. Electrical devices which do not follow Ohm's law: Group of answer choices are known as non-ohmic devices. do not exist.A 60W lightbulb in your house is left on for 25 minutes while you do some of your Foundations of Physics homework. A quick google tells you that the mains voltage in Australia is 230V. How many electrons pass through the lightbulb in that time?
- Res-monster maze. In the figure, all the resistors have a resistance of 4.0 2 and all the (ideal) batteries have an emf of 4.0 V. What is the current through resistor R? (If you can find the proper loop through this maze, you can answer the question with a few seconds of mental calculation.) O 4 A O 2 A O 1 A O 0.5 A wtwHIn circuit shown below, ε = 12 V, L = 100 mH, R₁ = 1 k and R₂ = 2 k. What is the current through the battery long time after the switch S has been closed? S R₂ ww E 200 mA ○ 6 mA ○ 4 mA ○ 12 mA ○ 18 mA ○ 100 mA ww R1 0000A 15.0-Ω resistor and a 40.0-Ω resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 15.0-Ω resistor: A current through the 40.0-Ω resistor: A (b) What is the voltage drop across each resistor? voltage drop across the 15.0-Ω resistor: V voltage drop across the 40.0-Ω resistor: V