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Electricity

Electricity. Electricity is the flow of electric current through a conductor . In mechanics the basic property of matter is mass , in electricity the basic property is charge. What is electricity?. How does electricity get to your home?.

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Electricity

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  1. Electricity

  2. Electricity is the flow of electric current through a conductor. In mechanics the basic property of matter is mass, in electricity the basic property is charge. What is electricity?

  3. How does electricity get to your home?

  4. There are two kinds of charges: positive and negative. Protons have a positive charge. Electrons have a negative charge. Where do charges come from?

  5. Charged particle are found in the atom. Protons are found tightly bound in the nucleus. Electrons are found whirling around the nucleus in orbits. Where do we find charges?

  6. Charges can never be created or destroyed (Conservation of charge). Unlike charges attract, like charges repel. How do charges behave?

  7. Charges behave according to Coulomb’s Law. This states that the force can be attractive or repulsive and weakens with distance. By what law do charges behave?

  8. Charges can be made to move when they are placed in a changing magnetic field. A moving magnet or a moving coil of wire near a magnet induces an electric current. What makes charges move?

  9. An electric current is measured in Amps. An amp is the flow of 1 Coulomb of charge per second. A coulomb is 6.24 x 1024 electrons How is an electric current measured?

  10. Electricity has a voltage which is like electrical pressure. This is measured in volts. It also encounters electrical resistance (friction) which is measured in ohms. What other properties does electricity have?

  11. Ohm’s law relates the quantities of electric current. It states : I=V/R R=resistance (Ohms) I=Current (Amps) V=Voltage (Volts) What law relates these quantities?

  12. Is there an analogy to explain Electric current ?

  13. Materials that offer a large Electrical resistance are called good insulators. Materials that offer little resistance are called good conductors. What affects resistance?

  14. Distance also affects resistance. The longer the distance the greater the resistance. Thick wires also have less resistance than thin wires. Are there other factors?

  15. Electric power is the amount of energy available per time It is measured in watts or kilowatts The equation is P=VI What is electric power?

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