Please answer all questions.

1			How many electrons per second pass through a section of wire carrying a current of 0.70 A?
			A)	6.2 x 1018 electrons/s
			B)	7.7 x 1029 electrons/s
			C)	4.4 x 1018 electrons/s
			D)	1.1 x 10-19 electrons/s
2			What is the current through an 8.0-W toaster when it is operating on 120 V?
			A)	15 A
			B)	960 A
			C)	0.067 A
			D)	1800 A
3			Compute the resistance of 180 m of silver wire having a cross-section of 0.30 mm2. The resistivity of silver is 1.6 x 10-8W•m.
			A)	9.6 ohms
			B)	2.7 x 10-17W
			C)	9.6 x 10-6 ohms
			D)	9.6 x 1016W
4			A heater is labeled 1600 W/120 V. How much current does the heater draw from a 120-V source?
			A)	13.3 A
			B)	0.075 A
			C)	192 kA
			D)	21 kA
5			What resistance must be placed in parallel with 20W to make the combined resistance 15W?
			A)	8.57 ohms
			B)	60 W
			C)	0.0167 ohms
			D)	0.117 ohms
6			Three resistors, of 8.0 W, 12 W, and 24 W, are in parallel, and a current of 20 A is drawn by the combination. Determine (a) the potential difference across the combination and (b) the current through each resistance.
			A)	(a) 5.0 V (b) 160 A, 240 A, 480 A
			B)	(a) 4.0 V (b) 0.1 A, 0.15 A, 0.3 A
			C)	(a) 0.45 V (b) 640 A, 960 A, 1920 A
			D)	(a) 80 V (b) 10 A, 6.7 A, 3.3 A
7			Three resistors, of 40 W, 60 W, and 120W, are connected in parallel, and this parallel group is connected in series with 15 W in series with 25 W. The whole system is then connected to a 120-V source. Determine (a) the current in the 25 W, (b) the potential drop across the parallel group, (c) the potential drop across the 25 W, (d) the current in the 60 W, (e) the current in the 40 W.
			A)	(a) 0.46 A (b) 240 V (c) 30 V (d) 2.0 A (e) 2.0 A
			B)	(a) 2.0 A (b) 40 V (c) 50 V (d) 0.67 A (e) 1.0 A
			C)	(a) 0.52 A (b) 80 V (c) 80 V (d) 1.0 A (e) 0.5 A
			D)	(a) 60 A (b) 10 V (c) 12.5 V (d) 1.5 A (e) 1.0 A
8			A dry cell delivering 2 A has a terminal voltage of 1.41 V. What is the internal resistance of the cell if its open-circuit voltage is 1.59 V?
			A)	0.09 ohms
			B)	0.18 ohms
			C)	0.71 ohms
			D)	1.5 ohms
9			When a battery goes "bad", which of the following is most likely to have happened?
			A)	The voltage was used up.
			B)	The battery's internal resistance increased.
			C)	The battery's internal resistance decreased.
			D)	The voltage was used up as well as the internal resistance decreased.
10			Appliances in the United States are designed to work on 110-120 volts, whereas appliances in Europe operate on 220-240 volts. What would happen if you tried to use a European electric shaver in the United States?
			A)	It would probably work as well as it does in Europe, since it is the power rating, not the voltage rating, that matters.
			B)	It would probably work about as well as it does in Europe, since it is the current rating, not the voltage rating, that matters.
			C)	It would barely work since the voltage here is too low to push enough current through the device.
			D)	It would probably overheat and burn up before very long.
11			We desire to measure the current through and the voltage across a resistor connected in a circuit. How should an ammeter and a voltmeter be connected to the resistor?
			A)	Both are connected in parallel with the resistor.
			B)	Both are connected in series with the resistor.
			C)	The ammeter is connected in series and the voltmeter is connected in parallel with the resistor.
			D)	The ammeter is connected in parallel and the voltmeter is connected in series with the resistor.
12			A series circuit consisting of an uncharged 2.0-µF capacitor and a 10-MW resistor is connected across a 100-V power source. What are the current in the circuit and the charge on the capacitor (a) after one time constant, and (b) when the capacitor has acquired 90 percent of its final charge?
			A)	(a) 10.0 µA, 0.2 mC (b) 9.0 µA, 45.0 mC
			B)	(a) 27.0 µA, 0.54 mC (b) 4.0 µA, 18.0 nC
			C)	(a) 3.7 µA, 0.13 mC (b) 1.0 µA, 0.18 mC
			D)	(a) 37.0 kA, 10.4 mC (b) 24.6 µA, 0.22 mC
13			A charged capacitor is connected across a 10-kW resistor and allowed to discharge. The potential difference across the capacitor drops to 0.37 of its original value after a time of 7.0 s. What is the capacitance of the capacitor?
			A)	1.89 mF
			B)	0.19 mF
			C)	0.70 mF
			D)	0.37 mC