'Ohm' is a unit for measuring -

The correct answer is electrical resistance.

Key Points

• The 'Ohm' is the SI (International System of Units) unit used to measure electrical resistance.
• It is denoted by the symbol Ω (omega).
• Electrical resistance is a measure of the opposition that a material offers to the flow of electric current.
• Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R) using the formula R = V/I.
• Ohms are named after the German physicist Georg Simon Ohm, who first defined the law of resistance in 1827.

Additional Information

• Voltage (V):
  • It is the electric potential difference or "pressure" that drives electric charge through a circuit.
  • Measured in volts (V), named after Italian physicist Alessandro Volta.
• Electrical Current (I):
  • It is the flow of electric charge through a conductor.
  • Measured in amperes (A), named after André-Marie Ampère.
• Conductivity:
  • It is the ability of a material to allow the flow of electric current.
  • The unit of conductivity is siemens per meter (S/m).
• Ohm's Law:
  • It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points.
  • The formula is expressed as V = IR.