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In basic circuit analysis using Ohm’s law, which type of electrical load is modeled as containing pure resistance only (i.e., no inductance or capacitance)?
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27. Resistors & DC Circuits
Resistors and Ohm's Law
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Ohm's law describes the relationship between which physical quantities in an electrical circuit (for an ohmic resistor)?
A
Current, power, and time
B
Voltage, charge, and capacitance
C
Resistance, magnetic field, and current
D
Voltage, current, and resistance
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Recall that Ohm's law is a fundamental principle in electrical circuits that relates three key physical quantities: voltage (V), current (I), and resistance (R).
Ohm's law states that the voltage across a resistor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance.
Mathematically, Ohm's law is expressed as \(V = I \times R\), where \(V\) is the voltage in volts, \(I\) is the current in amperes, and \(R\) is the resistance in ohms.
This relationship applies specifically to ohmic resistors, which have a constant resistance regardless of the voltage and current.
Therefore, the correct physical quantities described by Ohm's law are voltage, current, and resistance.
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