Which igniter requires the greatest current to initiate?

The correct answer, Copperhead igniters, are known to require a greater current to initiate compared to other types of igniters. Copperhead igniters utilize a nickel-chromium wire wrapped in a special coating, which generates intense heat when current flows through it. This heat is necessary to ignite the propellant in the rocket motor effectively.

The design and materials of Copperhead igniters mean that they require a higher electrical current to generate enough thermal energy for ignition. This characteristic is critical when considering safety and reliability during launch operations. Using an igniter that requires sufficient current ensures that there is enough energy to produce a consistent and reliable ignition of the motor.

Understanding this feature of Copperhead igniters helps emphasize the importance of matching the igniter type with the launch equipment being used, ensuring that the ignition system can provide the required current for successful ignition. Other types of igniters, while effective, do not demand as high a current, which distinguishes the Copperhead igniter in this regard.