Answer:
A battery-powered radio contains:
Electrical energy: Stored in the battery, which provides the power to the radio to function.
Sound energy: Produced by the radio as it converts the electrical signals into sound waves.
A hydropower dam contains:
Potential energy: Stored in the water held behind the dam due to its elevation.
Kinetic energy: The moving water generates kinetic energy as it flows through the dam and turns the turbine, which then generates electricity.
Electrical energy: Generated by the turbines and the generator that converts kinetic energy into electrical energy.
Using an unplugged iPhone contains:
Chemical energy: Stored in the battery of the iPhone.
Thermal energy: Produced due to the heat dissipated by the internal components of the phone during its operation.
Electromagnetic energy: Produced by the phone during the wireless communication (e.g., WiFi, Bluetooth) with other devices or when using the camera or the screen.