Question

select all hazards which are present when using power tools.
creation of faulty prototypes
electricity
excessive noise
moving parts which may cut skin

Explanation:

When using power tools, electricity can cause electric shocks. Excessive noise can damage hearing. Moving parts can cut skin. Faulty prototypes are a product - related issue, not a hazard during tool use.

Answer:

Electricity, Excessive noise, Moving parts which may cut skin