1. Current Electricity Current, Power and Energy

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

3. Voltage Voltage: is like the Potential Energy of Electricity. It’s what moves the electrons along. Ex: A 9volt battery is what pushes the electrons through a toy car. Variable: VUnit: Volt (V)

4. Current Current is how fast electrons are moving through an object (like a TV or a light bulb). Variable: I Unit: Ampere (A) 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 uses electricity to do work. Variable: PUnit: Watt (W) 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: Amt. of Bill ($) = (rate)(P)(t)

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)