In discussions about energy, two key aspects are essential. The first is actual power, which is quantified in Watts. The second is stored power, measured in Watt Hours.

Take, for instance, charging a 10 kWh battery: it requires a power input of 10 kW sustained over one hour.

 Moreover, power units are often abbreviated as they increase in magnitude. For example, 1 kWh equals 1,000-watt hours, and 1 MWh is equivalent to 1,000 kWh or 1,000,000 watt hours.