Podcast
Questions and Answers
Which of the following statements accurately describes electrostatic charge?
Which of the following statements accurately describes electrostatic charge?
- It is the property of a material that allows it to easily conduct electricity.
- It refers to the buildup of electric charge on a material, typically non-moving. (correct)
- It involves the continuous flow of electrons through a conductor.
- It describes the energy transferred by an electric circuit over time.
Why do like charges repel each other?
Why do like charges repel each other?
- Due to the gravitational force between them.
- Because they have different magnitudes of charge.
- Due to the fundamental properties of electric forces. (correct)
- Because they are separated by an insulating material.
During the process of charging by rubbing, what is actually occurring at the atomic level?
During the process of charging by rubbing, what is actually occurring at the atomic level?
- Electrons are transferred from one material to another. (correct)
- Protons are transferred from one material to another.
- The types of atoms within the materials are altered.
- New electric charges are created within the materials.
Why are metals generally better conductors of electricity than nonmetals?
Why are metals generally better conductors of electricity than nonmetals?
What term describes materials that allow electrons to pass through them easily?
What term describes materials that allow electrons to pass through them easily?
Which of the following describes the purpose of earthing?
Which of the following describes the purpose of earthing?
Why is earthing important for safety?
Why is earthing important for safety?
What occurs when an uncharged object becomes charged due to the presence of a nearby charged object?
What occurs when an uncharged object becomes charged due to the presence of a nearby charged object?
In electrostatic induction, what primarily happens within the neutral object when a charged object is brought nearby?
In electrostatic induction, what primarily happens within the neutral object when a charged object is brought nearby?
Which of the following instruments is designed specifically to detect the presence of electric charge?
Which of the following instruments is designed specifically to detect the presence of electric charge?
What is the standard SI unit for measuring electric charge?
What is the standard SI unit for measuring electric charge?
How is the unit microcoulomb related to the coulomb?
How is the unit microcoulomb related to the coulomb?
In photocopying, what role does the charged copying plate play?
In photocopying, what role does the charged copying plate play?
Why does the paper from a photocopier often feel warm?
Why does the paper from a photocopier often feel warm?
What is the primary difference between how inkjet printers and photocopiers use electrostatic charge?
What is the primary difference between how inkjet printers and photocopiers use electrostatic charge?
What happens to a negatively charged rod when it is brought near a piece of aluminum foil?
What happens to a negatively charged rod when it is brought near a piece of aluminum foil?
When a plastic comb is pulled through hair, the comb becomes negatively charged. What corresponding charge change occurs in the hair?
When a plastic comb is pulled through hair, the comb becomes negatively charged. What corresponding charge change occurs in the hair?
Which of the following best describes why copper is used as an electrical conductor rather than polythene?
Which of the following best describes why copper is used as an electrical conductor rather than polythene?
What is the primary safety concern associated with a buildup of electrostatic charge?
What is the primary safety concern associated with a buildup of electrostatic charge?
Based on the provided text, identify which material is classified as a semiconductor:
Based on the provided text, identify which material is classified as a semiconductor:
Flashcards
Electrostatic Charge
Electrostatic Charge
The buildup of electric charge on an electron receiving material, that is either isolated or not an electrical conductor. This charge is not moving.
Electrons
Electrons
Particles with a negative charge.
Protons
Protons
Particles with a positive charge.
Neutrons
Neutrons
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Conductors
Conductors
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Insulators
Insulators
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Semiconductors
Semiconductors
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Earthing
Earthing
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Coulomb (C)
Coulomb (C)
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Electroscope
Electroscope
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Study Notes
Chapter 8: Electricity
- Electricity for 8th Grade
Electric Charge
- Electric charge is a fundamental property of matter that causes it to experience a force when placed in an electromagnetic field.
Electrostatic Charge
- Electrostatic charge refers to the buildup of electric charge on an electron-receiving material that is either isolated or not an electrical conductor.
- It is not moving, hence it is referred to as static electricity.
Positive and Negative Charges
- There are two different and opposite types of electric charge; positive (+) and negative (-).
- Like charges repel each other; unlike charges attract each other.
- The closer the charges, the greater the force between them.
Charge Origin
- Electrons are negatively charged.
- Protons are positively charged.
- Neutrons have no charge.
- Rubbing materials together separates charges that are already present, not make electric charge.
Conductors
- Conductors are materials that allow electrons to pass through them easily.
- Metals are the best electrical conductors due to some of their electrons being loosely held to their atoms and can pass freely between them.
- Free electrons make metals good thermal conductors.
- Most non-metals conduct charge poorly or not at all, although carbon is an exception.
Insulators
- Insulators are materials that hardly conduct electricity at all.
- Their electrons are tightly held to atoms and are not free to move, although they can be transferred by rubbing.
- Insulators are easy to charge by rubbing because any electrons that get transferred tend to stay where they are.
Semiconductors
- Semiconductors are materials with conductivity between conductors and insulators.
- They are poor conductors when cold, but much better conductors when warm.
Earthing
- Earthing is preventing charge buildup by connecting objects to the ground by a conducting material so that the unwanted charge flows away.
Detecting Charges
- Instruments can detect electric charge.
Unit of Charge
- The SI unit of charge is the coulomb (C).
- One microcoulomb equals is 10^-6C.
- One coulomb is equal to the charge of billion billion electrons.
Electrostatic Charge Applications
- Electrostatic charges are used in everyday situations such as photocopiers and inkjet printers.
Photocopiers
- Use static electricity to copy paper documents, commonly in black and white.
- An image of the document is projected onto a positively charged copying plate.
- The plate loses charge in the light areas and keeps positive charge in the dark areas (i.e. the text).
- A negatively charged black toner powder is applied to the plate and sticks to the part where there is a positive charge.
- The toner is then transferred onto a new blank sheet of white paper
- The paper is heated to ensure the powder sticks
- The photocopy of the document is now made.
Inkjet printers
- Inkjet printers work similarly but use a small jet of colored ink that is negatively charged and attracted to the correct place on the page.
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