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be challenged and removed. (December 2009) (Learn how and when to remove this template message) An electrical load is an electrical component or portion of a circuit that consumes electric power.[1][2] This is opposed to a power source, such as a battery or generator, which produces what is a load in a circuit power.[2] In electric power circuits examples of loads are appliances and lights. The term may also
What Is Load Current
refer to the power consumed by a circuit. The term is used more broadly in electronics for a device connected to a signal what is load resistance source, whether or not it consumes power.[2] If an electric circuit has an output port, a pair of terminals that produces an electrical signal, the circuit connected to this terminal (or its input impedance) is the load. For example,
Electrical Load Examples
if a CD player is connected to an amplifier, the CD player is the source and the amplifier is the load.[2] Load affects the performance of circuits with respect to output voltages or currents, such as in sensors, voltage sources, and amplifiers. Mains power outlets provide an easy example: they supply power at constant voltage, with electrical appliances connected to the power circuit collectively making up the load. When a high-power appliance switches on, it dramatically reduces what is a load urban dictionary the load impedance. If the load impedance is not very much higher than the power supply impedance, the voltages will drop. In a domestic environment, switching on a heating appliance may cause incandescent lights to dim noticeably. A more technical approach[edit] This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (February 2015) (Learn how and when to remove this template message) When discussing the effect of load on a circuit, it is helpful to disregard the circuit's actual design and consider only the Thévenin equivalent. (The Norton equivalent could be used instead, with the same results.) The Thévenin equivalent of a circuit looks like this: The circuit is represented by an ideal voltage source Vs in series with an internal resistance Rs. With no load (open-circuited terminals), all of V S {\displaystyle V_{S}} falls across the output; the output voltage is V S {\displaystyle V_{S}} . However, the circuit will behave differently if a load is added. We would like to ignore the details of the load circuit, as we did for the power supply, and represent it as simply as possible. If we use an input resistance to represent the load, the complete circuit looks like this: The input resistance of the load stands in series with Rs. Whereas the voltage source by itsel
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Types Of Electrical Load
Textbook Vol. I - Direct Current (DC) DC Metering Circuits Voltmeter Impact on Measured
Load Resistance Definition
Circuit Table of Contents Voltmeter Impact on Measured Circuit Chapter 8 - DC Metering Circuits Every meter impacts the circuit it load voltage is measuring to some extent, just as any tire-pressure gauge changes the measured tire pressure slightly as some air is let out to operate the gauge. While some impact is inevitable, it can be minimized https://en.wikipedia.org/wiki/Electrical_load through good meter design. Since voltmeters are always connected in parallel with the component or components under test, any current through the voltmeter will contribute to the overall current in the tested circuit, potentially affecting the voltage being measured. A perfect voltmeter has infinite resistance, so that it draws no current from the circuit under test. However, perfect voltmeters only exist in the pages of textbooks, not in real life! Take http://www.allaboutcircuits.com/textbook/direct-current/chpt-8/voltmeter-impact-measured-circuit/ the following voltage divider circuit as an extreme example of how a realistic voltmeter might impact the circuit its measuring: With no voltmeter connected to the circuit, there should be exactly 12 volts across each 250 MΩ resistor in the series circuit, the two equal-value resistors dividing the total voltage (24 volts) exactly in half. However, if the voltmeter in question has a lead-to-lead resistance of 10 MΩ (a common amount for a modern digital voltmeter), its resistance will create a parallel subcircuit with the lower resistor of the divider when connected: This effectively reduces the lower resistance from 250 MΩ to 9.615 MΩ (250 MΩ and 10 MΩ in parallel), drastically altering voltage drops in the circuit. The lower resistor will now have far less voltage across it than before, and the upper resistor far more. A voltage divider with resistance values of 250 MΩ and 9.615 MΩ will divide 24 volts into portions of 23.1111 volts and 0.8889 volts, respectively. Since the voltmeter is part of that 9.615 MΩ resistance, that is what it will indicate: 0.8889 volts. Now, the voltmeter can only indicate the voltage its connected across. It has no way of “knowing” there was a potential of 12 volts dropped across the lower 250 MΩ resistor be
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