What is the unit of resistance in an electrical circuit?

The unit of resistance in an electrical circuit is the Ohm. This unit is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which defines the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's Law, resistance (measured in Ohms) is equal to the voltage (measured in Volts) divided by the current (measured in Amperes).

Resistance measures how much a material opposes the flow of electric current. A higher resistance indicates that it is more difficult for electric current to flow through the material, while a lower resistance allows current to flow more easily. This concept is fundamental in electrical engineering and circuit design, as it helps to determine how components in a circuit will behave and interact.

The other options represent different electrical measurements: Farads are used for capacitance, Watts measure power, and Joules represent energy or work. Each of these units has its own specific application within the field of electricity but does not pertain to resistance, which is why the Ohm is the correct and relevant unit in this context.