Presentation on theme: "BY MR. V. CALZADA & MRS. SWANSON Atoms, and Static Electricity."— Presentation transcript:
BY MR. V. CALZADA & MRS. SWANSON Atoms, and Static Electricity
circuit electric current. electromagnet resistance. electric charge. electric force. conductor. electric circuit insulator resistor. Vocabulary
A circuit is a closed path through which electricity travels. The flow of electric charges through a circuit is called an electric current. An electromagnet is made by passing an electric current through a wire that is wrapped around a metal object, such as a nail. Electric current does not pas easily through materials with high resistance. When an object gains or loses electrons, it has an electric charge. The attraction or repulsion between charges is called an electric force. Material that conducts electrons easily is called a conductor. An electric circuit is any path along which electrons can flow. An insulator is a material that doesn’t carry electrons. A material that resists the flow of electricity is called a resistor. An electromagnet is made by passing an electric current through a wire that is wrapped around a metal object, such as a nail. Vocabulary
Electricity is important. It runs computers, televisions, radios, and appliances. It lights homes and streets. It produces lightning. Law of conservation of energy. Electricity can be transformed into light, thermal, sound, and mechanical energy. Electric energy is produced by the movement of electrons. Electricity causes matter to move or to change. Electric Energy
Atoms and Electricity An atom is made of: electrons – negative charge protons – positive charge neutrons – no charge. Protons and electrons are attracted to each other. (Opposite attract) This is why electrons revolve around the nucleus of the atom. They are attracted to the protons of an atom. Most matter has an equal number of protons and electrons. Sometimes electrons are attracted to the protons of another object and rub off.
Atoms and Electricity Sometimes electrons are attracted to the protons of another object and rub off. Conductors such as metals allow atoms to jump easily between them. Insulators like rubber, plastic, wood, Styrofoam, and glass hold on to their electrons. Useful website: http://science.jrank.org/kids/pages/230/All- About-Electricity.html
Electric Charges & Forces When an object gains or loses electrons, it has an electric charge. An object that has gained electrons has a negative charge. An object that has lost electrons has a positive electric charge. Matter that has an equal number of protons and electrons has a neutral charge. When the attraction or repulsion between this charges is called an electric force. Charges of opposites types attract. Positive charges attract to negative charges. Like charges repel each other. A negatively charged object repels a negatively charged object. A positively charged object repels a positively charged object. Useful website: http://www.sciencebuddies.org/science- fair-projects/electricity-magnetism- electromagnetism-tutorial
Electric Charges and Forces: Positive and Negative Charges Attract Rubbing your feet across a carpet causes you to lose electrons. You are now positively charged because you have more protons than electrons. Your body now attracts electrons. Reaching for a metal object like a door knob causes some electrons to jump to your body. As a result you feel a shock and may even see a small spark. This is called static electricity. This is also an example of potential energy turning into kinetic energy. Electrons have stored potential energy when they are not moving but when opposite charged objects come close enough the electrons can move to the other object as an example of kinetic energy.
Electric Forces: Positive and Negative Charges Attract
Static Electricity Electric Forces: Opposite Charges Attract