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Current Electricity

Current Electricity. Current, Power and Energy. Current Electricity. _____________________________ is what you get when you plug something into the wall. There are lost of electrons in one place, but they are _________________ along wires and through electronic devices.

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Current Electricity

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  1. Current Electricity Current, Power and Energy

  2. Current Electricity • _____________________________is what you get when you plug something into the wall. • There are lost of electrons in one place, but they are _________________ along wires and through electronic devices. • That is the difference between static and current electricity.

  3. Voltage • Voltage: is like the ____________________of Electricity. It’s what moves the electrons along. • Ex: A 9volt battery is what pushes the electrons through a toy car. • Variable: ______ Unit: ___________

  4. Current • Current is ____________________electrons are moving through an object (like a TV or a light bulb). • Variable:_____Unit: ______________ • Current in electricity is similar to current in a river…

  5. Current • The faster we can move electrons, the more Current (I) we can get. • Current can be calculated using: ______________

  6. Example • A wire carries 10 Coulombs of charge past a certain spot every 2 seconds. What is the current in the wire?

  7. Electric Power • Electric Power is how quickly an object _____________________________________ • Variable: ______ Unit: _____________ • Most appliances are rated in Watts to tell you how much energy they use.

  8. Electric Power • Electric Power can be calculated using the formula: ____________________________ • Electronics with higher power ratings make your power bill go up!

  9. Example • If a 1000W microwave is plugged into a 120V outlet, what kind of current will it draw?

  10. Power Bills • The power company measures how much power you use in Kilowatts (kW), and they charge by the hour (h). • THIS IS THE ONLY TIME we’ll use kW and h for our units: when calculating a Power Bill.

  11. Power Bills • Power Companies charge a certain amount of money per Kilowatt-Hour. • Your Power Bill comes from: __________________________________

  12. Example • If you leave your 1500W TV on for a whole day, how much will it cost you if the power company charges 0.008 $/kWh? (Remember 1kW=1000W)

  13. Review • Our three new equations are: Charge (Q) – Coulombs (C) Current (I)- Amperes (A) Voltage (V)- Volts (V) Power (P)- Watts (W) Power Bill ONLY Power (P)- Kilowatts (kW) Time (t)- hours (h)

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