Multiple Choice
In the context of resistors and Ohm's law, which symbol and SI unit are used to represent electrical resistance?
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27. Resistors & DC Circuits
Resistors and Ohm's Law
Multiple Choice
In the context of resistors and Ohm's law, which component provides resistance in an electric circuit?
A
A resistor
B
A capacitor
C
An ideal voltage source (battery)
D
An ideal wire (conductor)
Verified step by step guidance1
Understand the role of each component in an electric circuit: a resistor, a capacitor, an ideal voltage source (battery), and an ideal wire (conductor).
Recall that resistance is a property that opposes the flow of electric current, causing a voltage drop according to Ohm's law, which is given by \(V = I \\times R\), where \(V\) is voltage, \(I\) is current, and \(R\) is resistance.
Identify that a resistor is specifically designed to provide resistance in a circuit, converting electrical energy into heat and controlling current flow.
Recognize that a capacitor stores energy in an electric field and does not provide resistance in the same way; an ideal voltage source provides voltage but no resistance; and an ideal wire is considered to have zero resistance.
Conclude that the component which provides resistance in an electric circuit is the resistor.
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