1. Calculate the electric potential difference if 1750 J of electric potential energy is transformed to move 3.1 C of electrons. T 2. Calculate the energy transformed in a 15 V adapter that has 0.075 C of electrons moving through it. T 3. How much charge is travelling through a 3.7 V cellphone that transforms 6.0 J of electrical energy? To 4. (a) A 7.0 W CFL bulb is on for 2.5 h. During that time, 525 C of electrons move through the bulb. Determine the electric potential difference of the CFL bulb. (Hint: you will need to use the power equation from Section 11.1.) (b) Each coulomb has 6.2 x 10" electrons in it. Calculate the number of electrons that were moved through the CFL bulb in part (a). 5. In medical television shows, doctors use defibrillators to try and establish a normal rhythm in a patient's heart. To do this they shock the heart with approximately 130 J of electrical energy at an electric potential difference of 710 V. Determine the amount of charge that is delivered to the heart. T11.5 Questions 6. Batteries have a rating system that includes the current and the time. A rechargeable AA battery might have a 2. What is the current if 2.5 C of charge (electrons) passes a rating of 2650 mAh. That is, the battery can produce a point in a circuit in 4.6 s? TAI C current of 2650 mA for 1 h before it is depleted. For how 3. Calculate the amount of charge travelling through a car long could it produce a current of 883 mA? TA battery when a current of 800.0 A is produced for 1.2 min. 4. For how long can a battery produce a current of 250 mA if 1.7 x 10% C of charge passes through it? Answer in seconds and minutes. T/1 5. LED lights require less power than incandescent lights. Calculate the time required for 150 JC of charge (electrons) to pass through an LED light if the current is 0.21 mA. T/11. What is wrong with the following information? State (a) Item V (V) I (A) whether you are applying KCL or KVL in your answer. K/V C (a) The current going into a parallel circuit is listed as source lamp 2 lamp 3 0.50 A and the current coming out of the parallel circuit lamp 1 2.0 3.0 is listed as 0.30 A. lamp 1 (b) A student measures the voltage across each of the lamp 2 1.0 1.5 three loads in a series circuit to be 10 V each. The lamp 3 voltage across the source is measured to be 10 V. (c) For a circuit with two lamps connected in parallel, a (b) Item V (V) I (A) student measures the voltage drop across one lamp to lamp 4 be 20 V. The student measures the voltage drop across source 24.0 2.0 the second lamp to be 10 V. lamp 2 | lamp 3 lamp 1 10.0 (d) A student is using an ammeter and notes that it reads lamp 2 6.0 0.15 A on the first lamp, 0.20 A on the second lamp, 1.0 lamp 1 and 0.25 A on the third lamp. The student says the lamp 3 lamps are connected in series. lamp 4 2. For each of the following circuits, the given values are listed in a table. Copy each table into your notebook and find the missing values. Tic (c) Item V (V) I (A) lamp 3 source 6.0 4.0 lamp 2 I lamp 4 () lamp 1 lamp 1 lamp 2 1.0 2.0 lamp 3 2.0 lamp 42. A portable electric fan is operating on a 9.0 V battery. The current going into the motor is 160 mA. Determine the resistance of the portable fan. T/ 3. Dry human skin has a resistance of approximately 100 000 0. If a person were accidentally to touch the terminals of a 9.0 V battery, what would be the current going through the skin? 4. Wet human skin has a resistance of approximately 1000 0. If a person were accidentally to touch a live circuit with 120 V of electric potential difference, what would be the current going through the skin? 5. A home theatre system has a speaker with a resistance of 8.0 0. It is connected to an amplifier that has a voltage of 5.2 V. Determine the current going to the speaker. T/I5. What is the equivalent resistance at the following circuits? Eaeli resislnr has resistance 12ft 1. [in a? n: {3} H1 R? R1 - II W In 1 W I o W 1- '- L F a; at a Questions 1. For each of the circuit diagrams below, the source has a voltage of 5.0 U. Each resistor has resistance 12.0 I). Find all the other values of current, voltage. and resistance. {a} a2 2. Draw a circuit diagram with a voltage source and three resistors connected in series. team = 151] v. lef2 = 4.0 v. 31 = soc , and 1'; = dad a. Find v1. v3. l1. l3, gum. RE, Re: and Radar 3. Draw a circuit diagram with a voltage source and three resistors connected in parallel. Fm\" = 1.5 U, :1 = [1.15 A. R? = 15 it, and HJ = 5M1. Find V1. L5, \"3, l2, l3, law\". H1, and Reel. 4. For the circuit diagram shown in Figure E. v. = 2.5 ti. lg = 5.5V, la: USDA, F5=.5l2la. l4 =.1l]u. and H! = F' I!" Find pseudo: lllr2| Lil-tr F5! JSenorita! '1: Ir5! H11 H2: H3: H5: and Rural. R1 2. A car battery transfers 19 200 J of energy to the starter in 2.0 s when you turn the key to start the engine. Calculate the power of the starter. 3. A 1200 W microwave oven transforms 1.8 x 105 J of energy while reheating some food. Calculate how long the food was in the microwave. Answer in minutes. 4. A plasma television requires 380 W to operate. A family watches television for 110 h in one month. Calculate how much energy is needed. Answer in joules and kilowatt hours