FDNY CoF Temporary Certificate Z-51 Practice Test 2026 – Complete Exam Prep

Electrical current is measured in Amperes, often referred to simply as "amps." This unit quantifies the flow of electric charge in a circuit. One ampere is defined as one coulomb of charge passing through a given point in a circuit in one second. Understanding this helps clarify how electrical circuits function, as the current represents the movement of electrons through conductive materials.

The other units mentioned are related to electrical systems but measure different properties. Volts measure electrical potential or voltage, indicating the force that pushes the current through the circuit. Ohms measure resistance, representing how much a material opposes the flow of current. Watts measure power, which is the rate at which electrical energy is consumed or produced, calculated as the product of current (in amps) and voltage (in volts). Each of these units plays a crucial role in understanding electricity, but only Amperes is the unit specifically designated for measuring electrical current.