Electricity For HVACR Practice Test

The unit of measurement for electrical resistance is defined as ohms. This unit represents how much a material opposes the flow of electric current. The concept is derived from Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. Therefore, when you measure resistance, you are essentially assessing how much the material will resist electric current flow. To put it in context: volts measure electric potential (the force that pushes electric charges), amperes measure the flow rate of electric current, and watts measure electrical power (the rate of energy transfer). Each of these units serves a different purpose in the realm of electricity, but when it comes to quantifying how much a component resists electric current, ohms is the accurate and standard measure.