Science, Maths & Technology
Transport and Sustainability
...family hatchback hybrids, such as the Prius, introduced in 1997 (Figure 11), incorporated a 30 kW (40 hp) electric motor and a 1.7 kWh nickel metal hydride (NiMH) battery (i.e. only a slightly larger storage capacity than a normal car lead-acid starting battery). They had CO2 emissions of about 90 grams per km compared to 130 grams per km for a comparable standard petrol...