Which of the following are units of electricity?

The correct answer includes Volt, Amp, Ohm, and Watt, which are all fundamental units in the study of electricity and electrical circuits. Each of these units serves a specific purpose:

• Volt (V) is the unit of electrical potential difference, indicating the amount of energy per unit charge available to move electric charges through a circuit.

• Ampere (A), commonly referred to as "Amp," is the unit measuring the flow of electric current, representing the amount of charge passing through a conductor in a given time.

• Ohm (Ω) is the unit of electrical resistance, defining how much a material opposes the flow of electric current.

• Watt (W) is the unit of power, calculating the rate at which electrical energy is transferred or converted in a circuit.

These units are foundational in understanding and measuring the behavior of electrical systems.

In contrast, the other choices include units that do not all pertain to basic electrical measurements, such as Joule (which measures energy) and Lumen (which measures luminous flux). Consequently, they do not form a coherent set of units specific to the field of electricity in comparison to the units provided in the correct answer.