Which device is designed to convert chemical energy into thermal energy and then into electrical current?

• A. Fuel cell
• B. Thermionic converter
• C. Electrolytic cell
• D. Photovoltaic cell

Answer: (B)

Verified step by step guidance

1. Understand the function of each device listed: A fuel cell converts chemical energy directly into electrical energy through electrochemical reactions.
2. An electrolytic cell uses electrical energy to drive a non-spontaneous chemical reaction, so it converts electrical energy into chemical energy, not the other way around.
3. A photovoltaic cell converts light energy (usually from the sun) directly into electrical energy, not involving thermal energy conversion.
4. A thermionic converter works by converting chemical energy into thermal energy first, which then causes electrons to be emitted (thermionic emission) and generates electrical current.
5. Therefore, the device designed to convert chemical energy into thermal energy and then into electrical current is the thermionic converter.