What is a common use for solar cells beyond road signs?

Solar cells are commonly used for charging mobile devices because they convert sunlight into electricity, making them an efficient energy source on-the-go. Solar chargers are portable and can harness solar energy to power various electronic devices, such as smartphones, tablets, and other small appliances, especially in areas where traditional power sources may not be readily available.

While other options, such as heating water, powering homes, and lighting parks also utilize solar energy, charging mobile devices stands out as a practical and widespread application directly benefiting individual users in a convenient way. The portability of solar panels designed for mobile device charging enables users to capture and use solar energy efficiently in various environments, appealing particularly to those who spend time outdoors or travel frequently.