What is the unit for measuring resistance and what symbol is used for it?

The unit for measuring resistance is the ohm, which is represented by the symbol Ω. Resistance is a crucial concept in electrical circuits, defining how much a component resists the flow of electric current. This relationship between voltage (V), current (I), and resistance (R) is articulated by Ohm's Law, which states that V = I × R.

In this context, understanding the correct unit and its symbol is vital for interpreting electrical equations and applications. The other options mention units or symbols that pertain to different electrical quantities: henries for inductance, volts for voltage, and a misattribution of the symbol for ohms. Recognizing these correctly ensures clarity in communication about electrical principles.