Which of the following components is essential for the combustion of gas?

The combustion of gas requires a burner as a crucial component. A burner is responsible for mixing the gas with air in the right proportions and facilitating the burning process. It provides the necessary environment for gas to ignite and sustain a flame, allowing various appliances to function effectively, such as heaters, stoves, and boilers.

While other options such as a thermocouple, ignition electrode, and gas meter play important roles in gas systems, they do not directly facilitate the combustion process. The thermocouple is often used for temperature measurement and safety monitoring, the ignition electrode is responsible for initiating combustion, typically by creating a spark, and the gas meter measures the flow of gas to ensure proper supply. However, without a burner, combustion would not occur, making it an indispensable element in gas combustion settings.