P4b-uses of electrostatics

Question 1

How is static electricity used in electrostatic dust precipitators?

Answer 1

1) when smoke particles reach the chimney they meet a high voltage negatively charged wire grid
2) dust particles gain electrons and become negatively charged
3) dust particles induce a charge on the earthed metal plates
4) dust particles attracted to metal platesnand stick together
5) plates struck and dust falls to collector

Question 2

How is static electricity used in spray painting?

Answer 2

• spray gun is charged and charges up the paint drops

- paint drops repel eachother and you get a fine spray

Question 3

How is static electricity used in painting to achieve an even coat?

Answer 3

The object to be painted is given an opposite charge to the gun which attracts the fine spray of paint

Question 4

How does a defibrillator work?

Answer 4

• 2 paddles placed firmly on the patients chest to get a good electrical contact
• then its charged up
• charge passes through paddles to the patient to make the heart contract

Question 5

What care has to be taken to make sure the operator is not shocked?

Answer 5

Everyone moves away from the patient except for the defibrillator operator who holds insulated paddles