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In the context of resistors and Ohm's law, which component provides resistance in an electric circuit?
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27. Resistors & DC Circuits
Resistors and Ohm's Law
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In a DC circuit, which component opposes current flow?
A
An ideal voltage source
B
An ideal wire (zero resistance)
C
A resistor
D
A capacitor at steady-state DC (after it is fully charged)
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Understand that in a DC circuit, current flow is influenced by components that provide resistance or opposition to the flow of charge.
Recall that an ideal voltage source provides a fixed voltage and does not oppose current; it actually drives current through the circuit.
Recognize that an ideal wire has zero resistance, so it does not oppose current flow at all.
Know that a resistor is a component specifically designed to oppose current flow by providing resistance, which converts electrical energy into heat.
Consider that a capacitor at steady-state DC acts like an open circuit (no current flows through it), so it effectively blocks current rather than opposing it like a resistor does.
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