Multiple Choice
In the context of resistors and Ohm’s law, what quantity describes the opposition to electric current flow in a circuit?
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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 SI unit is used to measure electrical resistance?
A
Ampere ()
B
Ohm ()
C
Watt ()
D
Volt ()
Verified step by step guidance1
Understand that electrical resistance is a measure of how much a material opposes the flow of electric current.
Recall Ohm's law, which relates voltage (V), current (I), and resistance (R) through the formula \(R = \frac{V}{I}\).
Identify the SI units for voltage and current: voltage is measured in volts (V) and current in amperes (A).
Using the formula \(R = \frac{V}{I}\), the unit of resistance is derived as volts per ampere, which is defined as the ohm (\(\Omega\)).
Therefore, the SI unit used to measure electrical resistance is the ohm (\(\Omega\)).
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