Casing: The casing of the camera protects the insides of the camera and keeps all of the mechanics in place. It prevents light from reaching the film when the shutter opens and closes.
Camera shutter: The shutter opens and closes between the lens and the film. The shutter's purpose is to control how long the film is exposed to light.
Camera Lens: The lens redirects beams of light bouncing off the object so they can form an image.
Camera film: The film of the camera is caused by light sensitive emulsions on a plastic base. The light strikes the emulsion which creates an image.
Camera flash circuit: The flash circuit makes a short flash when the shutter releases. The circuit has three parts. The battery is the source of energy for the flash to work, a gas discharge tube which enables the flash, and an electrical circuit that connects the power supply to the discharge tube.
Camera gas discharge tube: The gas discharge tube moves electrons from one electrode to the other. The transformation charges them therefore produces the flash.
Here is the flash circuit in the casing. This shows how the casing protects the important parts of the camera.