ABSTRACT
As the demand for energy drastically increased in the twentieth century, fossil fuels became the main source of energy due to convenience and cost. Over the years, however, the price of oil and problems caused by pollution have increased considerably, putting pressure on governments and industries to invest on other solutions to replace fossil fuels. Consequently, interest in other means of transportation, such as plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs), has increased again.
