Kamidere: Kamidere are people who think that what they think of the world in their own mind is correct apart from everyone elses beliefs. Kamidere people usually think of themselves as God and have their own way of thinking how the world should be in their own mindset... A good example of a Kamidere is Light Yagami from Death Note. He thinks of himself as a god that gets rid of all the impurities of the world by killing all murderers, rapist, etc.
Watt is the unit of electric power. One watt is defined as energy consumption rate of one joule per second.
Electric power is the rate at which an electrical circuit transfers  electric energy. The SI unit of power is the watt which is one  joule per second. Wattage, Watts, and (W) are what power is measured in there just different ways to say watts. Watts is the term used to define a quantity of power. If you were  looking for a device used to measure power, that is called a  wattmeter.