In electrical terms, what does 'ohm' measure?

The term 'ohm' is a unit of measurement used to quantify resistance within an electrical circuit. Resistance is the opposition that a substance offers to the flow of electric current. When a certain voltage is applied across a resistor, the ohm quantifies how much current will flow through the circuit; the higher the resistance, the lower the current for a given voltage.

According to Ohm's Law, the relationship between voltage (measured in volts), current (measured in amperes), and resistance (measured in ohms) is expressed as V = I × R. This means that for a fixed voltage, an increase in resistance results in a decrease in current, and vice versa.

Understanding this concept is crucial for diagnosing electrical issues in heavy-duty equipment, as recognizing how resistance affects the performance of components can lead to better troubleshooting and maintenance practices.