.net barcode reader open source Section 221 Current and Circuits in Objective-C

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Section 221 Current and Circuits
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12 Draw a circuit diagram to include a 600-V battery, an ammeter, and a resistance of 125 in series Indicate the ammeter reading and the direction of the current 13 Draw a series-circuit diagram showing a 45-V battery, a resistor, and an ammeter that reads 85 mA Determine the resistance and label the resistor Choose a direction for the conventional current and indicate the positive terminal of the battery 14 Add a voltmeter to measure the potential difference across the resistors in problems 12 and 13 and repeat the problems 15 Draw a circuit using a battery, a lamp, a potentiometer to adjust the lamp s brightness, and an on-off switch
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16 Repeat the previous problem, adding an ammeter and a voltmeter across the lamp
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Figure 22-8 These schematics show a parallel (a) and a series circuit (b)
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When a voltmeter is connected across another component, it is called a parallel connection because the circuit component and the voltmeter are aligned parallel to each other in the circuit, as diagrammed in Figure 22-8a Any time the current has two or more paths to follow, the connection is labeled parallel The potential difference across the voltmeter is equal to the potential difference across the circuit element Always associate the words voltage across with a parallel connection An ammeter measures the current through a circuit component The same current going through the component must go through the ammeter, so there can be only one current path A connection with only one current path, called a series connection, is shown in Figure 22-8b To add an ammeter to a circuit, the wire connected to the circuit component must be removed and connected to the ammeter instead Then, another wire is connected from the second terminal of the ammeter to the circuit component In a series connection, there can be only a single path through the connection Always associate the words current through with a series connection
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221 Section Review
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17 Schematic Draw a schematic diagram of a circuit that contains a battery and a lightbulb Make sure the lightbulb will light in this circuit 18 Resistance Joe states that because R V/I, if he increases the voltage, the resistance will increase Is Joe correct Explain 19 Resistance You want to measure the resistance of a long piece of wire Show how you would construct a circuit with a battery, a voltmeter, an ammeter, and the wire to be tested to make the measurement Specify what you would measure and how you would compute the resistance
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22 Current Electricity
20 Power A circuit has 12 of resistance and is connected to a 12-V battery Determine the change in power if the resistance decreases to 90 21 Energy A circuit converts 22 103 J of energy when it is operated for 30 min Determine the amount of energy it will convert when it is operated for 1 h 22 Critical Thinking We say that power is dissipated in a resistor To dissipate is to use, to waste, or to squander What is used when charge flows through a resistor
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222 Using Electric Energy
any familiar household appliances convert electric energy to some other form, such as light, kinetic energy, sound, or thermal energy When you turn on one of these appliances, you complete a circuit and begin converting electric energy In this section, you will learn to determine the rate of energy conversion and the amount that is converted
Objectives
Explain how electric energy is converted into thermal energy Explore ways to deliver electric energy to consumers near and far Define kilowatt-hour
Energy Transfer in Electric Circuits
Energy that is supplied to a circuit can be used in many different ways A motor converts electric energy to mechanical energy, and a lamp changes electric energy into light Unfortunately, not all of the energy delivered to a motor or a lamp ends up in a useful form Lightbulbs, especially incandescent lightbulbs, become hot Motors are often far too hot to touch In each case, some of the electric energy is converted into thermal energy You will now examine some devices that are designed to convert as much energy as possible into thermal energy Heating a resistor Current moving through a resistor causes it to heat up because flowing electrons bump into the atoms in the resistor These collisions increase the atoms kinetic energy and, thus, the temperature of the resistor A space heater, a hot plate, and the heating element in a hair dryer all are designed to convert electric energy into thermal energy These and other household appliances, such as those pictured in Figure 22-9, act like resistors when they are in a circuit When charge, q, moves through a resistor, its potential difference is reduced by an amount, V As you have learned, the energy change is represented by qV In practical use, the rate at which energy is changed the power, P E/t is more important Earlier, you learned that current is the rate at which charge flows, I q/t, and that power dissipated in a resistor is represented by P IV For a resistor, V IR Thus, if you know I and R, you can substitute V IR into the equation for electric power to obtain the following Power P I2R
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