Electricity Answer Key

- Current Electricity - Answers Name Date Block Electricity is the flow of tiny particles called Electrons . When electrons flow in a closed path , scientists call that an electrical _Circuit_ - which is an old word for go around . The flow of electrons is like the flow of water . Electricity can do all kinds of different jobs - all done with Electrons . When we get a flow of water or electrons going, we can do _work_. Did you know that .. . makes them last longer 1 . Keeping batteries in the fridge 2. Your brain uses the same power as a _10W_ light bulb. 3. _Cold _ metal conducts electricity better than _hot _ metal . Where does electricity come from? In _1831 , two scientists Michael Faraday (in Britain), and Joseph Henry (in the US) did an experiment . The experiment took a coil of _wire , moved it over a _magnet , which caused a _compass_ in another coil of wire to move. This was a very significant discovery. _ Solar cells convert _sunlight_ into electricity. metals will let In some materials, electrons can move from atom to atom very easily. electrons flow, but rubber and plastic_ wont . Things that let electricity go through them are called Conductors . Those that don’t are called Insulators . Those that are somewhere in between are called Resistors . They let some electrons to go through, but not all . Electrical Circuits and Water circuits both have _Pressure_ and F l o w . The pressure in electrical circuits is called _Voltage_. The higher the voltage, the more electrons want to jump. The number of electrons flowing through a wire is called the _Amperage_ - like the amount of water coming out of a drinking fountain. _ ‘Pressure ’ in water is the same as Voltage_ in electricity. ‘Flow’ in water is the same as _Amps_ in electricity. The combination of the two is called Watts . Electrons can be pushed by chemical reactions, like in a _Battery_, or they can be pushed by generators . Batteries and hot dogs are a lot alike. Just like in a hot dog, you have the meat with a roll around it, in a battery, you have a ‘ rod ’ with a ‘can’ around it. Between the rod and can, there are some goopy chemicals called _Electrolytes_. A battery has chemicals that can cause electricity to flow from one end of the battery to another. When the chemicals are used up, the electricity stops, and the battery is _Dead . Hydroelectric dams work when water falls, and it runs huge Generators electric power - 6 949 000 Kilowatts worth (in Grand Coulee Dam). that provide a lot of We use electricity all day. Once it is generated, it may travel 100’s of kilometres though powerlines before it gets to our home. When we make electricity with a coil of wire and magnet, either the coil or the magnet has to be J\4oving_. The coil can be right side up or upside down, and the electricity fluctuates. We say it is an _Altemating_ current, or AC. When electricity comes from batteries, it flows in only one direction, so it is JDirect_ current, or DC. A photovoltaic cell is a tiny cell that gives electricity when you shine sunlight on it. Birds can safely sit on a powerline because their bodies don’t complete the _circuit . Different countries use different style plugs, but they all have _2_ prongs because they all need to complete the Circuit_. Bonus: What is the name of the band playing at the end? Billy Ray Cyrcuits What style is the music - eg. Pop rock, rap, country, etc.? Country How many people sing in the video in total ? 2 (the boy, and then a girl later).