Which units among Joule, Watt, Newton/second, Horsepower does not relate to power?

This is another tricky question. All of the provided answers are actually units which do relate to power so this questions does not actually have a correct answer. A watt can also be called a Newton-meter per second and they are both units of power. A watt is the same thing that tells you how bright your lightbulbs will be.

Horse power is also a unit of power, seeing as it has the word power right in its name, this is not a tricky answer. It is usually in a physics course where you learn about power and the different categories of units of power.

Power has different units. It can be written as Watt or as Newton-meter per second. Power is also measured in horsepower. The Joule-second is a unit of energy. It is also often used as a plank constant. Power is basically the property of an object to do something. One watt of power is the resulting force exerted when one joule is burnt in 1 second.

In another context, the power is also a property of the direct current. It is calculated by multiplying the voltage with the current. Therefore, there are a number of different units of power that are employed in different situations, according to the context.