Harnessing Static Electricity in Industry and Medicine

The video reviews the uses of static electricity in various applications. It explains how electrostatic dust precipitators remove smoke particles from industrial chimneys, how static electricity enhances paint spraying by reducing waste and ensuring even coats, and how laser printers use static charges to transfer toner to paper. Additionally, it covers the use of static electricity in defibrillators to restart hearts. The video concludes with exam tips, emphasizing the importance of understanding the interaction of like and unlike charges.

What is the primary purpose of an electrostatic dust precipitator?

• To remove smoke particles from waste gases

• To generate electricity

• To increase the temperature of waste gases

• To cool down industrial chimneys

What is the role of high voltage in electrostatic dust precipitators?

• To increase the speed of gas flow

• To heat the particles

• To cool the chimney

• To collect as much soot and dust as possible

How do charged particles interact with metal plates in a chimney?

• They are attracted to oppositely charged plates

• They pass through without any interaction

• They are repelled by the plates

• They dissolve in the air

What happens to the soot and dust particles when they gain or lose electrons in a chimney?

• They change color

• They acquire a charge

• They dissolve in the air

• They become neutral

In paint spraying, why are paint particles given a charge?

• To make them dry faster

• To change their color

• To attract them to the object being painted

• To make them heavier

How does static electricity help in achieving a fine spray in paint spraying?

• By causing the paint particles to repel each other

• By making the paint particles heavier

• By changing the color of the paint

• By increasing the temperature of the paint

What happens to the toner in a laser printer when it is charged?

• It evaporates

• It is attracted to the charged parts of the drum

• It becomes liquid

• It changes color

What is the function of a defibrillator?

• To provide oxygen to the patient

• To restart a stopped heart

• To monitor heart rate

• To measure blood pressure

Why is it important for defibrillator paddles to have insulated handles?

• To make them lighter

• To prevent the operator from receiving a shock

• To improve grip

• To increase the voltage

Why do medical professionals shout 'clear' before using a defibrillator?

• To signal the end of the procedure

• To prevent the charge from affecting others

• To ensure everyone is aware of the procedure

• To startle the patient