Into to Electricity

• Show electricity video
• Handout Notes worksheet

Watt, Kilowatt, Ohm, Resistance, circuit, electron, Protons, Electron flow, Open circuit, Closed circuit, Magnetic field, Compact florescent, Incandescent

• Voltage is like the pressure in a water hose
• Current (amps) is the amount of water in the hose (Number of electrons)
• A static charge from rubbing your feet on the carpet is about 5,000 volts
• It takes less then an amp of current across the heart to kill you, a 9v battery can kill someone with the right conditions.

• 1 Joule / Second (Measures the rate at which energy is used)
• Why does this happen? (Trying to draw to much power through the circuit)
  • 15A x 110V = 1,650 Watts
  • A hair dryer is over 1,000 watts
  • Why are circuit breakers a good thing? (They help prevent fires from heat build up)
• ·CFL Vs. Incandescent Bulbs
• 100 Watt incandescent = 30 Watt CFL
• We could save 600 million a year if we only used CFL
• $0.09 a KwH
• How much could you save per light bulb over a year?
• Run the bulb 6 hours a day
  • CFL = 180 Watts/DayIncandescent = 600 Watts/Day
  • 180 Watts X 365 Days = 65,700 & 219,000 Watts
  • $5.85 a year or $19.71
  • You save 13.86 a year per bulb!
  • How many bulbs do you have in your home?
  • I have 30 bulbs so I save $415.80 a year
• CFL use less energy because they are more efficient and generate less heat

• Opposition to the flow of current through an object
• Copper has low resistance so we use it for wire because the electrons can break free easily.
• Plastics and other insulators have electrons that are not easy to break free.
• Resistance generates what? (Heat) and Why is that bad? (can cause house fires / loss of energy)

• Voltage Vs. Current
• What is a watt
• Resistance