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# 8-1 Electric Charge

## by guested7952 on Jan 07, 2010

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## 8-1 Electric ChargePresentation Transcript

• Warm-up(Own Paper!!)
What is kinetic energy?
It is the energy due to motion or the energy of moving objects.
What happens to kinetic energy when a ball is thrown up into the air.
Gravity converts the kinetic energy into potential energy.
• Warm- Up
Where is the force of gravity directed?
Down
What is the acceleration due to gravity?
9.8 m/s2
What are the two types of charge?
Positive & Negative
• 8-1: Electric Charge
Analyze factors that affect the strength and direction of electric forces and fields.
Describehow electric forces and fields affect electric charges.
Describe how electric charges are transferred and explain why electric discharges occur.
• Electric Charge
Electrical energy
Energy associated with electrical charges.
Electrical charges
A property that causes subatomic particles such as protons and electrons to attract and repel each other.
Protons – positive
Electrons – negative
• Charged objects
Objects become charged because there is an imbalance of protons and electrons.
Positive charge
More protons than electrons.
Negative charge
More electrons than protons.
Uncharged
Equal numbers of each.
• Charging Objects
Friction
Rubbing two objects together.
Balloon on hair, shoes on carpet, etc.
Conduction
Charge is transferred by contact.
Induction
A transfer of charge with out physical contact.
Conservation of Charge
The overall charge in the isolated system remains constant.
• Conduction
• Induction
• Electric forces
Like charges repel.
Opposite charges attract.
The electric force between two objects is directly proportional to the net charge on each object.
The electric force is indirectly proportional to the square of the distance between each object.
• Electric Fields
The space around the electric charge over which the charge exerts a force.
Electric field strength depends on:
The amount of charge that produces the field.
The distance from the charge.
• 2 Forms of Electricity
Static – a build up of charge on an object
Current – a steady flow of electrons through a conductor
• Conductors and Insulators
Insulators:
Slow or stop the flow of electrons.
Ex. Rubber, Glass, Plastic
(the rubber coating on the outside of an electrical cord)
Conductors:
Allow a free flow of electrons
Ex. Metals
(the wire inside an electrical cord)
• Conclusion
Write a short paragraph describing the interactions between charges.
Two types of charges
The forces between charges
Way charges are transferred to and from surfaces.