In the context of electric vehicles (EVs), a kilowatt-hour (kWh) is a unit of measurement used to describe the amount of energy stored in the vehicle’s battery. It represents the amount of energy needed to power the vehicle for a certain distance or period of time. 

For example, if an EV has a battery capacity of 60 kWh and an average range of 200 miles, it means that the vehicle can travel approximately 3.3 miles per kWh (200 miles / 60 kWh = 3.3 miles/kWh). This measurement is often used by electric vehicle manufacturers to advertise the vehicle’s range and efficiency. 

When charging an EV, the charging speed is often measured in kilowatts (kW), which represents the amount of power delivered to the vehicle’s battery per hour. For instance, a 50 kW charger can deliver 50 kWh of energy to the battery in one hour, which can provide a significant boost to the vehicle’s driving range.