Final answer:
Crank generators are made from materials such as magnetic coils and permanent magnets, chosen for their efficiency in converting mechanical energy to electrical energy. Strong and durable materials are used for the structural components to ensure longevity and effective energy conversion, tailored by mechanical engineers specializing in such technologies.
Step-by-step explanation:
The materials used to make a crank generator or a similar device are selected for their ability to efficiently convert mechanical energy into electrical energy. Such materials often include magnetic coils, permanent magnets, and various metals for the structural components of the generator. Designers choose these materials due to the phenomenon that when a magnetic field interacts with a coil of wire, and there is relative motion between them, electrical energy is generated. This is why coils of wire and magnets are fundamental to generators.
In the context of crank generators specifically, designers choose strong, durable materials for the crank itself to ensure it can withstand the repeated mechanical force necessary to drive the generator. Mechanical engineers, specializing in the principles of physics and materials science, would be involved in the design process, utilizing math and science to optimize the generator's efficiency and durability. They would account for factors such as friction, mechanical advantage, and ergonomics when designing the crank mechanism described as a wheel and axle in the provided information.