Which of the following quantities can be written in SI units in kgm²A⁻² s⁻³?
Correct Answer :
Resistance
Solution :
The correct option is Resistance.
To determine which physical quantity has the SI unit , we can derive the units of Resistance step-by-step from fundamental physical relationships.
1. According to Ohm's law, electrical resistance () is the ratio of potential difference () to electric current ():
2. Potential difference () is defined as the work done () per unit charge ():
3. The SI unit of work done () is the Joule (). In base SI units, work is force times distance:
4. The SI unit of electric charge () is the Coulomb (), which is equivalent to current () multiplied by time ():
5. Substituting the base units of work and charge back into the formula for potential difference ():
6. Finally, substituting this back into the formula for resistance () by dividing the unit of potential difference by the unit of current (Ampere, ):
Thus, the quantity that corresponds to the given SI units is Resistance.
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