CompTIA Network+ Practice Test

Which of the following best describes a watt (W)?

1. It measures the flow of electrons

2. It indicates the resistance of a device

3. It quantifies the energy consumed

4. It determines the efficiency of a circuit

The correct answer is: It quantifies the energy consumed

A watt (W) is a measure of power, which quantifies the rate at which energy is consumed or produced. In electrical terms, a watt is defined as one joule of energy transferred or converted per second. This means that when a device operates at a certain wattage, it indicates how much electrical energy it uses in a given time frame. For example, a 60-watt light bulb consumes 60 joules of energy every second. Understanding this is crucial in various fields, such as electrical engineering and network management, where knowing how much energy devices consume helps in planning energy use and ensuring that power supplies are adequate. This understanding also plays an integral role in energy efficiency practices and technology development. The other options focus on different aspects of electrical concepts. Measuring the flow of electrons relates to current, while resistance deals with how much a device opposes current and is described in ohms. Efficiency is about comparing output and input energy, which is important but distinct from what a watt represents. Thus, the choice that best conveys the purpose of a watt is its role in quantifying energy consumption.