A defibrillator is a machine that can be used by paramedics to restart your heart if it stops.
Two paddles with insulated handles are charged from a high voltage supply. They're put in good electrical contact with the patient’s chest. It's important that no one else gets a shock, which is why the paddles have insulating handles and the operator tells any one nearby to 'stand clear' before charge is passed through the patient to make the heart contract.
Car manufacturers can save money by using charged paint spray guns. They work because like charges repel and unlike charges attract.
The spray gun is charged positively, which causes every paint particle to become positively charged. Like charges repel and the paint particles spread out. The object to be painted is given a negative charge and so attracts the paint particles. The advantages of using this system are that less paint is wasted, the object receives an even coat and the paint covers awkward ‘shadow’ surfaces that the operator cannot see.
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