Elementary knowledge of electricity tells us that like charges repel and opposite charges attract. Here we improve the user's safety by giving his hand an electrostatic charge that is the same as the electric charge on the knife. So that when the user cuts through stuff, the knife is repelled whenever it is close to the user's hand.
This can be achieved by placing the knives in a rack that charges the knife's handle and the knife's blade with the same type of charge. When the user takes the knife, the user will share the charge of the handle since the human body is a good conductor of electricity. Since the user's hand has the same charge as the knife's blade, the blade will be repelled from the user's hand whenever they are brought close.
An alternative way to achieve the same result is to put on charged gloves that have the same charge as the knife's blade. Magnetic fields can also be used to implement this type of repulsion. It may even be better to use magnetic repulsion than using electrostatic repulsion since the magnetic poles of an object can be retained for long periods while electrostatic charges are easily lost. A drawback with using magnetic knives and gloves with magnetic tips is that a lot of the appliances and utensils in a kitchen are ferromagnetic.
The use of electric and magnetic fields to improve safety can also be extended to the case of other cutting tools and drilling instruments.