Resistor Behavior
Resistor Behavior - 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
Resistance depends on material, geometry, and temperature, so a component’s response is not determined by applied voltage alone. If one of these conditions changes, the current predicted from I = V/R or the voltage distribution in the circuit can change as well. Recording those conditions helps researchers interpret measurements and assess whether a simple fixed-resistance model remains suitable.
An ohmic resistor maintains a proportional relationship between applied voltage and current, as represented by I = V/R with a fixed R. A non-ideal system may not preserve that simple relationship when its conditions change. Comparing voltage and current responses therefore helps identify whether a fixed-resistance model is adequate for analysis or whether behavior must be treated as condition dependent.
The electrical power converted to heat is given by P = IV. Because current depends on voltage and resistance, changing the applied voltage or the resistance changes the rate at which energy is converted. This relationship lets circuit analysts evaluate energy use and recognize why resistor choices matter when a design must regulate signals or protect components.
Apply or identify a voltage across the resistor, measure the resulting current, and compare the values with the relationship I = V/R. Repeating this assessment under relevant material, geometric, or temperature conditions shows whether resistance remains consistent. The resulting information supports circuit analysis and helps separate expected ohmic behavior from responses affected by changing conditions.
Each resistance value influences how current and voltage are distributed across a circuit. Changing a resistor can therefore alter the electrical conditions experienced by other components, even when the circuit’s purpose remains unchanged. Accounting for this behavior helps designers regulate signals, analyze circuit operation, and choose resistance values that produce the intended electrical response.
Non-ideal behavior matters when a resistor does not follow a simple proportional current-voltage response under all conditions. Investigating such departures helps researchers examine how material, geometry, or temperature affect electrical systems rather than assuming idealized components. This context is important for interpreting experiments, improving circuit models, and understanding why measured outcomes may differ from basic predictions.