Electricity Chapter 10
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A form of energy that results from the interactions of charged particles such as electrons and protons.
Electric charge that remains static (doesn't move)/builds up.
Charging by Friction
- Involves the transfer of electric charges by rubbing/friction.
- E.g. socks on carpet or combing hair
- Used to determine the kind of electric charge produces on each substance when two substances are rubbed together.
- Refer to page 405 of the textbook for the table.
- Substances high on the table lose electrons and are positively charged.
- Substances low on the table hold onto electrons and are negatively charged.
- The closer two substances are on the table the weaker the ability to transfer electrons will be.
- A material in which particles cannot move freely between atoms.
- Wood, rubber, PURE water.
- A material in which particle can move freely between atoms.
- Metals (copper, aluminium), NOT PURE (with dissolved minerals) water.
- A material in which particles can move with some degree of freeness between atoms.
- Ground has a very large number of charges.
- Can make a charged object neutral by supplying or removing electrons.
- Ground always remain neutral due to the number of electrons
- A device that detects the presence of an electrical charge.
- Pith ball electroscope
- Metal leaf electroscope
Charging by Contact
- Generating a charge on a neutral object by touching it with a charged object.
- An object that gets charged by contact always gets the same charge as the object that charged it.
- Positively charged objects will turn a neutral object positive.
- The most that can happen to the first object is that it can turn neutral but that is unlikely.
- Examples in notes if needed
Law of Electric Charges
- Laws that describe how to objects interact electrically.
- Also, a neutral object will attracted to a charged object.
- The property of the space around a charged object,where the effect of its charge can be felt by other objects.
- An electric field produces an electric force on any other objects that are in the field.Objects with greater net charges have stronger electric fields.
- The greater the distance from the charged object the weaker the electric field on the object is.
Induces Charge Separation
The movement of electrons in a substance caused by the electric field of a nearby charge object, without direct contact between the substance and the object.
A positivity or negatively charged atom or group of atoms.
A metal sphere or point that is attached to the highest part of the building and is connected to the ground.
A type of cleaner that removes all the unwanted particles and liquid droplets from a flow of gas.
Van de Graaff Generator
A devices that accumulates very large charges.
A small device that measures and detects exposure to radiation.
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