Uses of static electricity
2 marks · NormalState and explain one reason why electrostatic spraying reduces waste compared to ordinary spraying.
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Because the paint/powder is attracted to the object by electrostatic forces, less material misses the target and less waste occurs.
Also accept: Paint is attracted to surfaces by electrostatics, meaning more paint stays on the object and less is lost.
Common mistakes: Just stating 'less waste' without explanation.
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Marking points
B1 · 1 mark · Correctly identifies reduction in waste/overspray.
B2 · 1 mark · Explains this is due to electrostatic attraction pulling material onto the object (less misses).
Worked solution
Electrostatic attraction between the charged spray and the oppositely charged object pulls more particles onto the object, so less is lost as overspray and waste is reduced.