The methods of standardization or calibration employed have much in common even in the cases that appear most diverse.
The joule (/ËdÊuËl/), symbol J, is a derived unit of energy in the International System of Units. It is equal to the energy transferred (or work done) to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or NÂ·m).
Energy can be measured in Joules *, or in Kilowatt-hours (KWh), and in various other energy units, like the way amounts of money can be measured in pounds, dollars, euros, etc. The type of concept of a battery full of energy is like a bucket full of water, or like a bag full of cash. POWER is a rate of flow of energy. It is energy per second, so its standard unit is the Joule per Second (which is the same as Watts). It can also be measured in kilowatts, megawatts, etc. Using the money analogy, power is like income or spending power, a rate at which you can transfer money.