Load Resistor
Load Resistor - Related Videos
11:34
Series and Parallel Resistors
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN This experiment demonstrates how current is distributed in resistors connected in series or parallel, and thus describes how to calculate the total "effective" resistance. Using Ohm's law, it possible to convert between the voltage and current through a resistance, if the resistance is known. For two resistors connected in series, (meaning that they are wired one after the...
01:10
Resistors In Series
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2023
A resistor is an ohmic device that limits the flow of charge in a circuit. Most circuits have more than one resistor. If several resistors are connected together and connected to a battery, the current supplied by the battery depends on the equivalent resistance of the circuit. The equivalent resistance of a combination of resistors depends on both their individual values and how they are connected. The simplest combination of resistors is the series combination. In a series circuit, the...
01:18
Combination Of Resistors
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2023
Electrical devices in any circuit can be connected either by series or parallel connections. Additionally, circuits can be connected involving both of these connections, known as combination or complex circuits. As these circuits have complex resistor connections, it is necessary to identify different parts as either series or parallel connections, then the whole combination of series and parallel resistors can be reduced to a single equivalent resistance. With the known equivalent resistance...
01:23
Resistors In Parallel
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2023
Resistors are in parallel when one end of all the resistors are connected to a continuous wire of negligible resistance and the other end of all the resistors are also connected to one another through a continuous wire of negligible resistance. In the case of a parallel configuration, the potential drop across each resistor is the same. Current through each resistor can be found using Ohm’s law, I = V/R, where the voltage is constant across each resistor. The sum of the individual currents...
01:31
Resistor in an AC Circuit
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2023
An alternating emf or voltage source is needed to supply an alternating current (AC) to a circuit. A coil of wire rotating in a magnetic field at a constant angular speed represents such a source. It also generates a sinusoidal alternating emf and serves as an industrial alternator. One-way current through the meter is measured using diodes. A diode is a device with better conductivity in one direction compared to the other; in its ideal state, it has zero resistance in one direction and allows...
FAQs
The resistance sets the relationship between applied voltage and resulting current through Ohm’s law, V = IR. For a fixed voltage, increasing resistance reduces the current, while decreasing resistance increases it. This controllable relationship allows physicists to examine how a source behaves as electrical demand changes, rather than evaluating the source under only one operating condition.
A resistor converts electrical energy into heat, with power described by P = VI or P = I²R. If the selected component cannot accommodate the power produced under its operating conditions, overheating can result. Matching the resistance and power rating to the circuit therefore supports reliable measurements and helps prevent damage during power-supply testing or circuit analysis.
Power dissipation depends on both the voltage across the resistor and the current through it. Because current is linked to resistance by V = IR, changing the resistance changes the electrical demand and can alter the heat produced. Examining these relationships helps explain why a load resistor can reveal changes in voltage, current, and power transfer.
Selection begins by choosing a resistance that creates the intended electrical demand, then confirming that its power rating is suitable for the expected operating conditions. The choice should support the experiment’s goal, such as testing a power supply, establishing a circuit condition, or limiting current. Appropriate selection improves measurement reliability and reduces overheating risk.
A load resistor gives a power supply a defined electrical demand that can be examined during operation. Researchers can observe the resulting voltage and current and assess how the source responds under that demand. This approach provides a more realistic evaluation than analyzing the supply without a connected load, while also supporting power-transfer measurements.
They are useful when an experiment requires a controlled resistance to set current or create a specified electrical demand. Connecting a suitable value can establish the conditions under which a circuit is analyzed, while the resistor’s power rating helps maintain those conditions safely. In physics and electronics, this supports repeatable measurements and evaluation of circuit response.