Pedal-powered machines are devices that use human pedaling as a source of energy. These machines convert the mechanical energy generated by pedaling into useful work, such as grinding grain, generating electricity, or pumping water. They are often designed to be simple and efficient, making them accessible for various applications, especially in areas with limited access to electricity. Common examples of pedal-powered machines include the bicycle generator, which produces electricity for lighting, and the pedal-powered water pump, used in agriculture. These machines promote sustainability by utilizing human power, reducing reliance on fossil fuels, and encouraging physical activity.