As the joule is larger, it’s more useful for describing a wider range of processes, which is why the joule is the SI unit instead of the electron volt. This makes the electron volt very useful for describing the energy changes involved in atomic and nuclear processes.
We can convert between the electron volt and the joule using this expression, which shows the amount of energy described by the electron volt is incredibly small compared to the joule. The electron volt is defined as the energy gained by an electron when it is accelerated through a potential difference of one volt. The joule is the energy needed to raise the temperature of one gram of water by one over 4.184 degrees Celsius. Which one is the SI unit? Why, that’s the joule. So, we have two units here that measure energy. Finally, the electron volt also measures energy. We can also eliminate the kilogram, which is the unit for mass. The mole measures the amount of substance, so we can eliminate this option. While power is related to energy, the watt does not measure energy, so this is not the correct answer. The watt measures power, which describes how much energy is transferred per unit time. Let’s run through the units in our answer choices to see which ones measure energy. We can define time as time taken to do work. Work is defined as a force causing the movement or displacement of an object. We want to know the SI unit for energy, which is a system’s capacity for doing work. Power: In physics, power is the rate at which energy is used, transferred, or transformed. We can define power as the rate of doing work or simply the work done in unit time. They are a set of standardized base units derived from fundamental constants. These units are the fundamental units in the metric system. SI units make up the International System of Units. What is the SI unit for energy? (A) Watt, (B) joule, (C) mole, (D) kilogram, or (E) electron volt.
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