9) A/an__ is a unit of measurement for electrical resistance. a) Volt b) Ohm c) Amp d) All of the above

Ohm is the correct answer! The concept of resistance can be traced back to the work of German physicist Georg Simon Ohm, who formulated Ohm's Law in the 1820s. This law establishes a fundamental relationship between voltage, current, and resistance in electrical circuits, making it the cornerstone of electrical engineering. In real-world applications, understanding resistance is crucial for designing and troubleshooting circuits. For instance, a resistor's ohm value determines how much current (measured in amps) will flow through a circuit when a certain voltage is applied. Knowing this helps engineers create safe and efficient electronic devices!