An ampere (A) is the unit of measurement for electric current. It measures the amount of electrical current flowing through a circuit during a specific time interval. The ampere is named after Andre-Marie Ampere, a French mathematician and physicist who was one of the main discoverers of electromagnetism.
Ohm (#) is the unit of measurement for electric resistance, which is the opposition to the flow of an electric current through a circuit.
Volt (V) is the unit of measurement for electric potential difference, which is the energy required per unit charge to move a test charge between two places in a static electric field.
Watt (W) is the unit of measurement for power, which is the rate at which energy is used or generated in an electrical circuit.
References:
"Current" (https://www.britannica.com/topic/current-electricity)
"Electric current" (https://www.sciencedirect.com/topics/engineering/electric-current)
"Units of Measurement" (https://www.allaboutcircuits.com/textbook/direct-current/chpt-1/units-of- measurement/)