One ohm is equal to:

Correct option is A

The correct answer is (a) 1 volt / 1 ampere

Explanation:
• According to Ohm’s Law, the resistance of a conductor is defined as the ratio of the potential difference applied across it to the current flowing through it.
• Mathematically, this relationship is written as: R = V / I.
• The SI unit of electrical resistance is the ohm, named after the German physicist Georg Simon Ohm.
• One ohm is defined as the resistance of a conductor when a potential difference of 1 volt across its ends produces a current of 1 ampere through it.
• Therefore, 1 ohm = 1 volt / 1 ampere.

Information Booster:
• Resistance is the property of a conductor that opposes the flow of electric current.
• The resistance of a wire depends on its length, its cross-sectional area, and the nature of the material (resistivity).

Additional Knowledge:
• 1 volt / 1 coulomb (Option b):
This represents potential difference per unit charge and does not define the unit of resistance.

• 1 volt × 1 ampere (Option c):
This represents electric power, and its unit is the watt.

• 1 volt × 1 coulomb (Option d):
This represents electrical work or energy, and its unit is the joule.