- A battery converts chemical energy into electrical energy for powering electrical devices
- A radio is a kind of electrical device
- Hence, the battery converts chemical energy into electrical energy to power a radio

So, the battery converts chemical energy into electrical energy to power a radio
Carlos puts a new battery into a radio. What does the battery supply to the radio that makes it turn on?
- A battery converts chemical energy into electrical energy for powering electrical devices 
- A radio is a kind of electrical device