Electricity and Magnetism Grade 5KE Unit A

Electricity is… Electricity is made up of microscopic electrons They move and carry an electrical charge. An electrical current is when the electrons flow or move Ex. Electrons from a battery flow to a clock and power the clock with their electrical charge Electricity is…

Naturally occurring electricity Human-made electricity Electricity powers many, many things around us Everything you have to plug-in, runs on electricity Brainstorm some naturally occurring electricity and some human-made electronics Naturally occurring electricity Human-made electricity It is an Electric World

Naturally Occuring Electricity

Naturally Occurring Electricity Write any 3 examples of Naturally Occurring Electricity in your notes: In nature, some organisms can produce their own electrical charge Electric eels, catfish, fireflies, stingrays Your brain and nervous system produces electricity Lightning is a form of natural electricity Naturally Occurring Electricity

Where does Electricity come from? Electricity is made or produced from power plants – called the mains supply Where does Electricity come from?

The power plants produce electricity in turbines, using water, heat-from coal or wind

Batteries Electricity also comes from batteries There are many different sizes of batteries and they all have different amounts of power Batteries

Types of batteries Car battery Watch battery  Button cell AA, AAA, AAAA, C, D 9-volt Phone battery Galvanic cell, voltaic cell, electrochemical cell. Rechargeable  Lithium Ion Types of batteries

Batteries Batteries are storage cells of electricity. Batteries are also called cells. A battery has a positive terminal and a negative terminal Does this positive and negative remind you of anything? A terminal is where the electricity flows, much like a terminal in a train station Batteries

Electrical Current Electricity flows just like water from a hose The flowing electricity is called an electrical current Currents of electricity flow through power lines, transformers and through wires in our homes. Let’s do a demonstration! Electrical Current

A conductor is an object that allows electrons to flow easily through it. Most metals, like copper and aluminum, graphite, water, and people are good conductors. Conductors

Insulators are objects that do not allow electrons to flow easily through it or at all Wood, plastic, rubber are good insulators Insulators

Resistors slow down electrons Resistors slow down electrons.  When an electron is slowed down, it heats up. Wire, steel wool, and carbon filament are all examples of resistors. Resistors

Electricity is very dangerous Electricity is very dangerous. It is important to follow a few safety rules. 1. Never use electricity in or near water. 2. Never place to many plugs in one socket. 3. Never play near or on power lines. 4. Never pull out a plug, by its cord. 5. Never stick anything into a plug in. Electricity Safety

Electricity Safety 6. Never run electrical cords under rugs. 7. Never use an electrical lawn mower on wet grass or when it is raining. 8. Never play on power boxes. 9. Never stick anything metal into a toaster. 10. Never use a frayed cord. Electricity Safety

End of Information on Quiz #1 Good job! If you understand all the information in this Powerpoint, all of our in-class demonstrations, and your review questions – you are ready! We have more to learn about Electricity & Magnetism after this quiz… I hope you’re “buzzed” about this!

Circuits A circuit is a circular movement of electrons. In a circuit, the electrons flow from the battery to the load and back to the battery. In order for the circuit to work, it must be complete. Circuits

Open vs. Closed Circuits Circuits can be open or closed. An open circuit has a break or opening in the circuit.  The circuit will not work. A closed circuit has no openings or breaks. The circuit will work because the electrons can flow in a complete circle. Open vs. Closed Circuits

If you have a circuit with one bulb, a battery and wires, How can you increase the brightness of the bulbs? If you add a battery, you can make the bulb brighter. Adding a battery, increases the amount of electrons that power the bulb, making more light. Adding a Battery

Switch In a circuit, it is important to be able to turn it off and on. A switch is a device that can open or close a circuit. A switch can be used to turn on or off the circuit, in this example, the light. Switch

This is a build up of stationary electrons on a surface of an object. For example, electrons from your hair build up on the surface of a balloon as you rub it against your head. This creates an electrostatic negative charge. Static Electricity

The balloon is can now stick to a surface because the balloon is acting like a magnet. The positive electrons are trying to move to the negative electrons. Static Electricity

Magnets A magnet is an object that produces an magnetic field. Magnets have a north and south pole. The north pole repels the north.  The south repels the south. The north and the south are attracted to each other. Magnets

Energy Conservation Why is important to conserve energy? Many ways that are used to produce energy are with non-renewable resources.  It is important for us to want to conserve our non-renewable resources.  We want future generations to have what we have today. If we run out of oil, their will be no more and we will not be able to use our cars, machines, etc. Energy Conservation