1. A defibrillator passes11A of current through the torso of a person for0.0065s. Part (a)How much charge moves in C?

2. Suppose you have a 3.2 V flashlight

What current, in amperes, flows through the bulb of the flashlight when its resistance is 3.65 ? 3. The diameter of a specific copper wire is 8.422 mm, and has a resistivity of 1.72 10-8 m. Find the resistance of a 1.1 km length of such wire used for power transmission in . Problem 4: An extension cord that has a length of 9.75m is made from wire with a resistivity of 7.14108m and a diameter of 0.292cm

Part (a) What is the resistance, in ohms, of the extension cord? Suppose a flashlight has 6.8 102 C of charge pass through it during time 0.25 h. What is the rate of the flashlight's energy consumption, in watts, if it operates at a voltage of 3.00 V? Problem 6: Military aircraft use 400 Hz AC power, because it is possible to design lighter-weight equipment at this higher frequency. What is the time for one complete cycle of this power in ms? Problem 7: During surgery, a current as small as 20.0 A applied directly to the heart may cause ventricular fibrillation If the resistance of the exposed heart is 290 , what is the smallest voltage that poses this danger in mV? In the figure, these three resistors are connected to a voltage source so that R2 = 4.75 and R3 = 9.5 are in parallel with one another and that combination is in series with R1 = 1.75 . Calculate the power being dissipated by the third resistor R3, in watts. Problem 9: If you try to measure the voltage of a battery with a voltmeter connected in series, as shown in the figure, you won't get a completely accurate measurement because of the internal resistance of the battery. To see how large this effect is, consider trying to measure the terminal voltage of a 3.200 V lithium cell having an internal resistance of 25 by placing a 0.25 k voltmeter across its terminals. What current, amperes, does the cell supply? A power source supplies a prescribed voltage and is used to power a light bulb. If another light bulb is connected in series to the first how would it affect the current in the power source? The current would increase. The current would decrease. The current would remain the same. Cannot be Determined. You need to replace an aluminum wire in a circuit with a wire of the same material, but 4 times longer. If you want the total resistance of the circuit to remain the same, what should the diameter of the new wire be? 2 times diameter of initial wire. of diameter of initial wire. of diameter of initial wire. Same as diameter of the initial wire. 4 times diameter of initial wire. Consider a resistor like the one shown in the figure, with the current moving in the direction shown'Which of these statements is correct? Electric potential at point a is lower that electric potential at point b, and the charges are moving with the same speeds at those points. Electric potential is higher at point a than electric potential at point b, and the charges are moving with the same speeds at those points. Electric potential at point a is the same as electric potential at point b, and as a result charges are moving with the same speeds at those points. Electric potential at point a is higher than electric potential at point b, and as a result charges are moving faster at point b. Electric potential at point a is lower than electric potential at point b, and as a result charges are moving slower at point b. Problem 13: Three different resistors are connected in series to a battery. Which of the following statements is correct about this circuit? All of these options are true. The equivalent resistance of the circuit is the algebraic sum of all resistors. Currents through all resistors are the same. Total voltage on this combination is an algebraic sum of voltages on each resistor Problem 14: Consider two identical electric bulbs of power P and resistance R. You connect them to a battery of voltage V. The first time you connect them in series with each other, and the second time in parallel. How will the illumination of the connection in parallel compare with the connection in series? Half of the illumination of connection in series. One-fourth of the illumination of connection in series. The same illumination as connection in series. Four times greater illumination as connection in series. Twice as much illumination as connection in series. Problem 15: The current flowing in a given circuit can be described by the function: I(t) = Imax(1 - e-t/),

where Imax = 16 A and = 2.1 s At what time in seconds is the current equal to 75% of the maximum current? A cylindrical disk of radius r = 13.5 cm and thickness H = 3.5 cm is made from a material that has a resistivity = 1.7 10-5 m. We wish to determine the resistance across the diameter of the cylinder. Integrate over the diameter of the cylinder to write equation for the resistance in terms of , H, and r. Problem 17: A bank of batteries, total emf = 4.5 V, is connected with resistor R = 180 k, capacitor C = 680 pF, and two-pole switch S as shown. The switch is initially set to point b so that the resistor and capacitor are in series. The switch is left in this position for a sufficiently long time so that the capacitor is completely discharged. The switch is disconnected from point b and connected to point a. What will happen to the voltage across the capacitor? The voltage will drop exponentially with time. The voltage will increase linearly with time. The voltage will immediately drop to zero. The voltage will drop linearly with time. The voltage will not change. The voltage will increase exponentially with time. The voltage will immediately rise to .