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What is the SI unit of electric resistance?
Ohm
Volt
Ampere
Watt
Ohm
The SI unit of electric resistance is the Ohm (╬й). It defines the ratio of potential difference across a conductor to the current flowing through it, as established by Ohm's Law.
The SI unit of electric resistance is the Ohm (╬й). It defines the ratio of potential difference across a conductor to the current flowing through it, as established by Ohm's Law.
Think of resistance like the width of a pipe; a narrow pipe (high resistance) makes it harder for water (current) to flow compared to a wide pipe (low resistance).
VIR (V=IR): Volt is equal to Current times Resistance.
R=IVтАЛ тАФ Ohm's Law definition of resistance
R=╧БAlтАЛ тАФ Resistance in terms of resistivity (╧Б), length (l), and cross-sectional area (A)
Resistance is the opposition offered by a material to the flow of electric current. According to Ohm's law, for a conductor at a constant temperature, the resistance R is defined as the potential difference V divided by the current I. One ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt applied to these points produces a current of one ampere.
Named after German physicist Georg Simon Ohm.
The reciprocal of resistance is called conductance, measured in Siemens (S).
Resistance depends on temperature, material properties, length, and cross-sectional area.
Enables precise control of current flow in electrical circuits.
Resistance causes energy loss in the form of heat, known as Joule heating (I2R).
Current limiting in electronic circuits.
Heating elements in appliances like toasters and water heaters.
Standard symbol for Ohm is the Greek letter capital omega (╬й).
Volt (Option B) is the unit of electric potential difference.
Ampere (Option C) is the unit of electric current.
Watt (Option D) is the unit of electric power.
A is correct тАФ Ohm is the internationally recognized SI derived unit for measuring electrical resistance.
Always remember the base units: Resistance is measured in Volts/Ampere; power is measured in Joules/second (Watts). Matching the unit to the dimension is a common way to solve RRB JE questions.
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