Current electricity

elephantnose fish – 500 electric sensors to help find food at night electric eel – thousands of muscle cells in tail that work like little batteries electricity bursts up to 5X that of a wall socket stun prey and attract mate Pacific electric ray – electric organ in head generate enough electricity to knock down a human

Learning goals We are learning to understand current electricity. We are learning to examine the components and makeup of circuits.

Continuous flow of electrons two conditions needed: an energy source a complete path to flow through (electrical circuit) current electricity: continuous flow of electrons in a circuit

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Electric circuits electrical load: device that converts electrical energy to another form of energy heaters, lamps, light bulb, computer hard drive switch: device that turns the circuit on/off by closing/opening switch closed = circuit complete and electrons flow switch open = break in path; no flow

Electric circuits wire: provides a path for the electrons to flow insulator and conductor source: provides the electrons battery

Electrochemical cells package of chemicals that converts chemical energy into electrical energy that is stored in charged particles battery electrolyte: liquid or paste that conducts electricity contains chemicals that form ions electrode: metal strips that react with electrolytes zinc and copper used in a battery

Electrochemical cell

Electrochemical cell wet cell: liquid electrolyte cars and other motorized vehicles dry cell: paste instead of liquid electrolyte flashlights, hand-held video game devices, cameras, watches electrodes called terminals – end points where we make a connection

Recycling and recharging recycle contain toxic chemicals rechargeable dry cells – used many times less impact on environment

Fuel cells generates electricity directly from a chemical reaction with a fuel e.g., hydrogen electric vehicles

Forms of current electricity current electricity can be produced directly or it can be generated in a generating station direct current (DC): a flow of electrons in one direction through an electric circuit battery alternating current (AC): a flow of electrons that alternates in direction in an electric circuit wall outlets

Please complete How is current electricity different from static electricity? What is an electric circuit? List three components of an electric circuit. What is the difference between an electrolyte and an electrode? Why should dry cells be recycled rather than thrown in the trash?

Learning goals We are learning to understand current electricity. We are learning to examine the components and makeup of circuits.

Please complete