Series Circuits 10–1 CHARACTERISTICS OF SERIES CIRCUITS When any number of devices are connected so that there is only a single circuit path for electrons, the devices are in series. Each device has the same amount of current in it; see Figure 10–1. Christmas tree lights are generally connected in series. For many years such […]
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Direct current fundamentals
Electrical power and energy : energy and cost calculations, efficiency of energy conversion, a practical application—resistance heating and summary of electrical power and energy
9–4 ENERGY AND COST CALCULATIONS Electrical energy is commercially sold in units called kilowatt-hours. The consumption of energy is not only a function of the power rating of the appliance, but also of the amount of time for which it is employed. Obviously, it makes a difference on your electrical bill whether you burn a […]
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Electrical power and energy : energy and cost calculations, efficiency of energy conversion, a practical application—resistance heating and summary of electrical power and energy
9–4 ENERGY AND COST CALCULATIONS Electrical energy is commercially sold in units called kilowatt-hours. The consumption of energy is not only a function of the power rating of the appliance, but also of the amount of time for which it is employed. Obviously, it makes a difference on your electrical bill whether you burn a […]
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Electrical power and energy : energy , units of energy and power
Electrical Power and Energy 9–1 ENERGY In Section 2–8 we discussed the conversion of electrical energy to perform work. The type of work or change accomplished involves force and motion. The following changes all require energy: mechanical movement, the production of heat or light, the production of sound, the conversion of one chemical compound into […]
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Electrical power and energy : energy , units of energy and power
Electrical Power and Energy 9–1 ENERGY In Section 2–8 we discussed the conversion of electrical energy to perform work. The type of work or change accomplished involves force and motion. The following changes all require energy: mechanical movement, the production of heat or light, the production of sound, the conversion of one chemical compound into […]
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Resistance : power ratings , variable resistors , schematic symbols and summary of resistance
7–11 POWER RATINGS Resistors also have a power rating in watts. Exceeding this rating will damage the resistor. The amount of heat that must be dissipated by the resistor can be determined with one of the following formulas: EXAMPLE 7–10 The resistor shown in Figure 7–29 has a value of 100 ohms and a power […]
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Resistance : power ratings , variable resistors , schematic symbols and summary of resistance
7–11 POWER RATINGS Resistors also have a power rating in watts. Exceeding this rating will damage the resistor. The amount of heat that must be dissipated by the resistor can be determined with one of the following formulas: EXAMPLE 7–10 The resistor shown in Figure 7–29 has a value of 100 ohms and a power […]
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Ohm’s law : voltage, current, and resistance, ohm’s law with metric prefixes and summary of ohm’s law
Ohm’s Law 8–1 VOLTAGE, CURRENT, AND RESISTANCE The three quantities E, I, and R relate to one another in a very significant way. This relationship, first formulated by the German scientist Georg S. Ohm, states that the current (I) is directly proportional to the voltage (E) but inversely proportional to the resistance (R). In other […]
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Ohm’s law : voltage, current, and resistance, ohm’s law with metric prefixes and summary of ohm’s law
Ohm’s Law 8–1 VOLTAGE, CURRENT, AND RESISTANCE The three quantities E, I, and R relate to one another in a very significant way. This relationship, first formulated by the German scientist Georg S. Ohm, states that the current (I) is directly proportional to the voltage (E) but inversely proportional to the resistance (R). In other […]
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Resistance : resistors , fixed resistors and color code
7–8 RESISTORS Resistors are one of the most common components found in electric circuits. The unit of measure for resistance is the ohm, which was named for the German scientist Georg S. Ohm. The symbol used to represent resistance is the uppercase Greek letter omega (V). Resistors come in various sizes, types, and ratings to […]
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