Current Electricity http://www. bing. com/videos/search Current Electricity http://www.bing.com/videos/search?q=Bill+Nye%3a+Current+Electricity&FORM=HDRSC3#view=detail&mid=0AE4B02BBE26ECAD67350AE4B02BBE26ECAD6735 (20 min) Electric current is a flow of electric charge.  Electrons moving in a conductor such as a copper wire. Ions through an electrolyte Battery or salt solution

CONDUCTORS AND INSULATORS Conductors allow electrons to flow through them easily. Copper atom has one valence electron. Valence electrons of conductors can gain enough energy to break away and become free electrons. Free electrons can move from one atom to another. http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/valenceshell.htm Cu

CONDUCTORS AND INSULATORS Insulators do not allow electrons to flow through them easily. They are materials that do not have any free electrons. They do not make good conductors of electrical currents. Ex wood, plastic, rubber, noble gases Insulators can protect us from electric shock

Electric Circuit: A continuous path in which electric current will flow. Example: current flowing from the power source, through a copper wire to a light bulb, and back to the power source. Batteries have many electrons at one end (-ve) and few at the other (+ve). The electrons want to balance this charge but they need a conductive path for them to travel through.

Electric Circuit: If the (+ve) & (-ve) sides of the battery are connected by a conductor, electrical current will flow as the electrons move from the (-ve) side to the (+ve )side. (+) (-)

Components of a Simple Circuit: Schematic Diagram of a simple circuit: (copy table 4 on p606 into notes) Source of electrical energy: (ie: a battery) Electrical load: Anything that converts electrical energy to another form of energy (ie: toaster converts electrical energy to heat) Circuit control device: (ie: a switch, a timer) Connectors: wires that connect the components of a circuit together

Read page 507-509 Answer # 2-6 page 510 Electric Current: CURRENT ELECTRICITY: http://www.youtube.com/watch?v=5laTkjINHrg (10 min) (intro current, coulomb) Introducing Current Electricity: Read page 507-509 Answer # 2-6 page 510 Electric Current: Read page 556-557 Answer # 1-3 page 557 Potential Difference: Read page 560-561 Answer # 2-4 page 561

Electric Current: Electric current (I) is the amount of electric charge (Q) that pass a given point in a conducting wire every second(t). I= I is measured in SI units called amperes (A). Q is measured in coulombs (C). A coulomb is the charge carried by 6.25 x 1018 electrons t is measured in seconds (s) An Ammeter: Is a device used to measure the electric current.] Q t

Potential Difference: Electric potential difference is the difference in potential energy (E) per unit charge (Q) at one point of the circuit compared to another point in the circuit. SI Unit: Volt (V)  V= A Voltmeter: Is a device used to measure the electrical potential difference. E Q

Potential Difference: (10 min) Https://www.youtube.com/watch?v=l8JS8BbrVOg (4 min)