In a gun-type bomb, Uranium-235 is the fuel. In an implosion bomb, Plutonium-239 is the fuel. A fusion-boosted atomic bomb uses the implosion design, with the addition of gaseous tritium (Hydrogen-3). Producing the appropriate amounts of fuel for bombs is expensive, time-consuming, and difficult.
What does an inhibitor switch do? An inhibitor switch basically tells your vehicle whether its in motion or in park. It can tell the car to park or to go into first gear etc.
The functionality of the neutral safety switch has changed greatly through the automotive development era, what was once a simple switch for the reverse lights and starter safety circuits, this switch has now become a multi-function gear position sensor which provides feedback data to the body and engine computers, all related functions are then carried through the operating system.