Solar Energy
Solar powered cars use sun energy to run an electric motor. The excess energy from bright sunlight also charges up storage batteries. In the off-sun time (either at night or cloudy periods), the batteries will be used to power the motor or other devices.
Let's look at the efficiency of using a solar cell to convert light into electricity directly. In this case, we will demonstrate the idea of converting light energy into electricity using an electrical light bulb (100 W clear GE). This is a two-step conversion process (a really stupid idea if you think about it). The first step is to apply 120 V AC to the light bulb and convert electrical energy into light energy. Then, we will convert the light energy into electrical energy using a photovoltaic cell (commonly called a solar cell). [Why is this stupid? But this is a good demonstration of stupidity nevertheless.]