Which measurement unit expresses electric energy consumption?

The unit that expresses electric energy consumption is the watt. Watts measure the rate at which electrical energy is used or produced. In terms of electric appliances or devices, the watt indicates how much energy is consumed over time when the device is operational.

It's important to note that while joules also measure energy, they are typically used in a broader context and are not as commonly referenced in the everyday discussion of electrical consumption. A watt is specifically defined as one joule per second, which captures the dynamic nature of power consumption.

KiloWatts represent a larger-scale measurement of power, often used in utility billing to quantify energy consumption over time, but they are a derivative of watts. Volts, on the other hand, measure electrical potential, which is different from the actual energy consumption a device might require. Therefore, the watt clearly stands out as the correct choice for expressing electric energy consumption.