Title: Circuit symbols and simple circuits Learning Objective: Today we are going to learn about simple circuits. Identify and draw circuit symbols Construct simple circuits from a diagram Drawa diagram from a set up circuit Key words: Bulb Switch Component Symbol Diagram Circuit Do Now Write the date and title in your books. List 5 things that use electricity. Explain how they work. What is electricity? Some particles carry an electric charge. In electric wires these particles are electrons. We get an electric current when these charged particles move from place to place. Electric current An electric current is a flow of charge, and in a wire this will be a flow of electrons. We need two things for an electric current to flow: 1. Something to transfer energy to the electrons, such as a battery or power pack 2. A complete path for the electrons to flow through (an electric circuit) Circuit component • Circuits can have lots of different components. It all depends on what their function is. • We cant be expected to draw a copy of each component every time we draw a circuit, so to make things easier, we use symbols. Draw me a bulb Draw me a battery Draw me a switch Look at your drawings • Are they the same as mine? • Are they the same as your neighbours? • WHY DO YOU THINK IT IS OMPORTANT THAT DIAGRAMS ARE ALL THE SAME? bulb bulb switch switch ammeter ammeter A cell cell wire wire voltmeter voltmeter V resistor resistor fuse fuse Now… • How do I put these together into a diagram? Becomes… Circuit Diagrams What are the advantages of drawing a circuit diagram using symbols? Drawing Circuits 1) A cell, a bulb and a switch ‘in series’ What does ‘series’ mean? 2) A battery of cells, a switch twowith bulbsthis in circuit What isand wrong series diagram? Task – Circuit Diagram Drawing Task – Draw the circuit diagram for each of the circuits detailed below. 2 1 3 4 5 Your turn • Using the worksheets, try to make these circuits. • If you need help, ask a friend first. • If you are really stuck then ask me! How did we get on? • Try to create your own circuits and draw them in your books. True or False? I am the symbol for a bulb B True or False? I am the symbol for a bulb True or False? I am the symbol for a cell True or False? I am the symbol for a battery True or False? Electricity is a Force True or False? Electricity is a type of energy True or False? We use a voltmeter to measure electrical current True or False? This is the symbol for an ammeter a True or False? Electrical current gets used up in a circuit True or False? Electrical current is the flow of electrical charges (electrons) around a circuit True or False? Homework • Learn the circuit symbols and definitions for a test next lesson.