Load Resistor Testing
Load Resistor Testing - 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
Apply a known voltage or current and compare the measured electrical response with the expected resistance relationship. Using Ohm’s law, engineers calculate the resistance from those measurements rather than relying only on a nominal value. A mismatch can indicate an incorrect resistor value or a problem in the test connections, making the electrical response diagnostically useful.
Power dissipation and temperature show whether the resistor remains stable while carrying the intended load. A resistance value may appear correct at a light demand yet be accompanied by excessive heating when the operating condition is applied. Monitoring these variables helps engineers determine whether the component can safely support the test and whether its performance changes under load.
Repeated or ongoing observations of the electrical response can show whether performance remains consistent under the applied demand. Stability matters because a resistor that changes behavior during operation may not provide a dependable load for validating another circuit. Recording resistance, power dissipation, and temperature together helps relate any performance change to the operating condition.
Begin by applying a known voltage or current to the resistor, then measure the resulting electrical response. Calculate resistance with Ohm’s law and monitor power dissipation, temperature, and stability during the operating condition. Interpreting these measurements together can expose incorrect resistance, excessive heating, connection faults, or changes that emerge only while the load is active.
It is useful when a system must be evaluated under a controlled, realistic electrical demand. Common engineering uses include validating power supplies, testing batteries and circuits, verifying electronic designs, and troubleshooting unexpected behavior. The controlled load allows engineers to assess whether the system delivers reliable performance while also checking the resistor’s response under the same demand.
During power-supply validation, the resistor provides a controlled demand against which the supply’s electrical response can be assessed. Engineers can compare the applied condition with the measured response and observe power dissipation, temperature, and stability. These observations help reveal whether the supply performs reliably under load and whether problems arise from the resistor, connections, or broader system behavior.