(a) What is the definition of the volt?

Video transcript

Welcome back, everyone. Which of the following incorrectly defines the vault. We're given four answer choices and we're going to analyze each of them. Let's begin with a it states that it is a relax reaction with a net positive voltage that is always spontaneous. Essentially, this is true. Let's recall that the change in the gibbs free energy is equal to the negative number of moles of electrons transferred multiplied by far days constant multiplied by the standard cell potential. We know that a spontaneous reaction is negative in terms of its gibbs free energy change, which essentially tells us that the voltage or the standard cell potential should be positive. Meaning option A is correct, a redux reaction with a net positive voltage is always spontaneous based on the equation. Now, let's think about option B in a galvanic cell. The net voltage is positive, which is true. This is the definition of a galvanic cell. Specifically, we're looking at the galvanic cell and not the electrolytic cell, right. So in this case, we're going to say it's true by definition of what a galvanic cell is, it will always have the net positive voltage. Now we're going to consider option C and it sells that a vault equals one kilojoule of energy per one column of charge. Immediately. We should notice that we are using units that are non SI units specifically, there's a prefix K in kilojoule, right? And vault is an SI unit. Now, si units are derived from other si units. The definition of a vault is a one jewel of energy transferred per one column of charge. So C is actually incorrect because it uses kilojoules instead of joules which define the vault. And therefore we can exclude option D which says none of the above, right? As a result, the correct answer to this problem would be option C A volt equals one kilojoule of energy per one column of charge does not define the vault correctly. Thank you for watching.