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Brazilian former Formula One driver Nelson Piquet Jr won the initial season of Formula E - the first world racing championship for electric cars.

All the single-seater vehicles were exactly the same, and resembled F1 cars. They initally had top speeds of 200 km/h and drivers had to switch vehicles halfway through the race.

Nelson tells Daniel Raza about the "chaotic" first race in Beijing in 2014 and what it felt like to become champion.