In what units are turbine engine ignition systems measured?

The correct answer is Joules, as turbine engine ignition systems are often measured in terms of energy output for the purpose of initiating combustion within the engine. Ignition systems need to produce a sufficient amount of energy to create a spark capable of igniting the fuel-air mixture in the combustion chamber. Joules, being a unit of energy, effectively conveys the amount of energy released by the ignition system.

Understanding this context clarifies why Joules is the relevant unit; it directly relates to the function of igniting the fuel rather than simply measuring electrical parameters or temperatures. This makes it a practical choice for assessing the performance and efficiency of ignition systems in turbine engines.