Reading Resistance (2) Current (A) Terminal Voltage (V) 1 0.5 0.2 1.5 2 1.0 0.15 1.4 3 2.0 0.10 1.3 4 3.0 0.08 1.2 LO 5 5.0 0.05 1.1 6 7.0 0.04 1.05 7 10.0 0.03 1.02 00 8 15.0 0.02 1.01 9 20.0 0.015 1.005 10 50.0 0.005 1.001
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- What would be the maximum cost of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60-W bulbs? Assume the cost of the incandescent bulb is 25 cents and that electricity costs 10 cents/kWh, Calculate the cost for 1000 hours, as in the cost effectiveness of CFL example.1. The amount of current following in a circuit was measured to be 1 = 0.00037 A a. Express in Powers of Ten for 10-1, 10-2 10-3, 10-4, 10-5 10-6 * 10-1 A x 10-2 A b. Express in mA c. Express in UA x 10 A x 10-4 A x 105 A x 10-6 A units units7.) Suppose 10 mA of current is flowing through an electrical circuit. How many Amperes are flowing in the circuit? a. None of these b. 0.1 A c. 0.001 A d. 0.01 A 19.) If 1.5 volts (DC) is applied across a resistor and 200 mA of current is flowing through the resistor, how much power is dissipated by the resistor? a. None of these b. 300 W c. 0.3 W d. 30 W 20.) If 24 volts is dropped across a resistor and the resistors value is 1.2 kΩ, how much current is flowing through the resistor? a. 0.02 A b. None of these c. 20 A d. 0.2 A
- 14. A power supply providing 85 V is hooked in series to a lightbulb, using two connecting wires. The lightbulb has a resistance bulb B. of 130 N and the wires have a resistance of 15 2 each. The actual question is, how much power does the bulb use, and how much power is lost in the wires? This is broken down into steps. a. What is the equivalent resistance of the series circuit? [160 Q] b. What is the current through the circuit? [.53 A] c. What is the magnitude of the potential difference between points A and B? (What is the voltage across wire 1?) [8 V] d. What is the magnitude of the potential difference between points wire 1 wire 2 A B and C? (What is the voltage across the bulb?) [69 V – note that the voltage across the bulb is NOT the 85 V of the power supply. The sum of the voltages, 8+69+8, around the circuit, IS the voltage of the power supply.) e. How much power is used by the bulb? [36.6 W] f. How much power is lost in the one of the wires? [4.2 W] |Four identical resistors are connected in parallel to an ideal 12.0-V source. If the equivalent resistance of the system is 1.00 kN, the current passing through each resistor is most nearly A. 0.0833 mA. B. 12.0 mA C. 3.00 mA. D. 0.333 mA. E. 4.00 mA.18. A 6V battery having an internal resistance 60 is connected to a load resistor. The current through the circuit is 0.1A. The terminal voltage across the load is a. 6.2V b. 6.6V c. 6V d. 5.4V 19. If the velocity and acceleration of an object are in the same direction, a. The object remains at rest. b. The speed of the object increases with time. c. The speed of the object decreases with time d. The speed of the object remains constant.
- 6. For the RC circuit shown, determine the charge on the plates of the capacitor after 40 x 10-3seconds, if R = 20 2, C=1x 10-3F, and e = 3000 volts. Assume the capacitor is charging. C 1.92 b. 2,59 c. 2.74 d. 2.81 none of the above a. e.A +3 B. 4 -8 :C. -23 +17 D. +8 -6 1.1.8. A factor that does not affect the resistance of the resistor A. The temperature of the conductor 3. The length of the conductor then s C. The diameter of the conductor es are' D. The shape of the conductor 1.1.9. The SI unit of the electric charge A. Volt B. Ampere C. Coulomb D. Meter424 uiz Electromagnetism Question 6 of 10 A student made the electromagnet shown and used it to pick up one sewing pin. She then doubled the number of coils around the nail and used it to pick up two sewing pins. How could she change the electromagnet again in order to pick up three sewing pins?
- 9. If the circuit has voltage, V, what is an expression for the current of the circuit? a. 5/RV b. 3RV c. 2R/3V d. 3V/5R5. The graph shows the voltage as a function of x. What is E, at x = 2.5 m? 2 а. b. What is E, at x = 1.5 m? -1 2 3 x (meters) V (volts)The time constant in an RC circuit is the time it takes a. so that the current drops to zero. b. so that the current reaches its maximum value c. so that the capacitor is fully charged. d. in which the current decreases to 37% of its initial value.