_Electricity.pdf

Welcome to our Science Class! Grade 3 SLIDESMANIA.COM Work Plan - Routines Interactive Activity Discussion Activity (Moodle Quiz) Wrap up SLIDESMANIA.COM Work Plan - Routines 3rd Term Orientation Interactive Activity Discussion (Electricity) Activity (Moodle Quiz) Wrap up SLIDESMANIA.COM ELECTRICITY...

Welcome to our Science Class! Grade 3 SLIDESMANIA.COM Work Plan - Routines Interactive Activity Discussion Activity (Moodle Quiz) Wrap up SLIDESMANIA.COM Work Plan - Routines 3rd Term Orientation Interactive Activity Discussion (Electricity) Activity (Moodle Quiz) Wrap up SLIDESMANIA.COM ELECTRICITY Science 3 SLIDESMANIA.COM Science News Today SLIDESMANIA.COM Major US Study Confirms a New #1 Cause of Disease Worldwide Conditions affecting the nervous system – such as strokes, migraines and dementia – have surged past heart disease to become the leading cause of ill health worldwide, a major new analysis said on Friday. SLIDESMANIA.COM The study was carried out by hundreds of researchers led by the US-based Institute for Health Metrics and Evaluation (IHME), which has become a global reference for health statistics. Let’s have an activity … SLIDESMANIA.COM What is electricity? Electricity is a supply of electrical energy. Electricity is a flow of electric charges along a wire. This flow of electric charge is called a current. SLIDESMANIA.COM Electrical Charges 01 There are two types of electrical charges: Positive and negative charges. An object with positive charge pulls on an object with negative charge. SLIDESMANIA.COM Protons - have a positive charge Neutrons - have no charge (they're neutral) electrons - have a negative charge. SLIDESMANIA.COM Kinds of Electricity 02 1. 2. 3. 4. Static Electricity Current Electricity Batteries Renewable Electricity SLIDESMANIA.COM Static Electricity: This kind of electricity happens when tiny particles in objects gain or lose electrons. For example, when you rub a balloon on your hair and it sticks to the balloon, that's static electricity! SLIDESMANIA.COM Electricity can be supplied from either a battery or a main supply. Wires carry electricity from power stations to our homes/schools/offices. SLIDESMANIA.COM The main advantage of electrical energy is that it can be transported over large distances to our homes. Static Electricity Static electricity is the build up of an electrical charge on the surface of an object. It's called "static" because the charges remain in one area rather than moving or "flowing" to another area. SLIDESMANIA.COM SLIDESMANIA.COM Electric Current Electric current is the flow of an electric charge. It is an important quantity in electronic circuits. Current flows through a circuit when a voltage is placed across two points of a conductor. This electric current provides the energy that we need to power many products such as radios, lights and many others that we need. SLIDESMANIA.COM Electrical Circuits An electrical circuit is a path for transmitting the electric current or moving electricity. It allows electricity to be used to provide power to lights, appliances and many other devices. SLIDESMANIA.COM Current is the flow of an electric charge. It is an important quantity in electronic circuits. Current flows through a circuit when a voltage is placed across two points of a conductor. SLIDESMANIA.COM Flow of Electrons In an electronic circuit, the current is the flow of electrons. However, generally current is shown in the direction of the positive charges. This is actually in the opposite direction of the movement of the electrons in the circuit. SLIDESMANIA.COM How is current measured? The standard unit of measurement for current is the ampere. It is sometimes abbreviated as A or amps. The symbol used for current is the letter "i". SLIDESMANIA.COM Current is measured as the flow of electric charge over time through a given point in an electric circuit. One ampere is equal to 1 coulomb over 1 second. A coulomb is a standard unit of electric charge. Calculating Current SLIDESMANIA.COM Current can be calculated using Ohm's Law. It can also be used to figure out the resistance of a circuit if the voltage is also known or the voltage of a circuit if the resistance is known. ce I = V/R where I = current, V = voltage, and R = resistance Current is also used to calculate power using the following equation: P=I*V where P = power, I = current, and V = voltage. SLIDESMANIA.COM Open and Close Circuit diagram SLIDESMANIA.COM Parts of a Circuit An electric circuit has to have a power source, wires for the electricity to flow through, and a device such as light bulb that uses electric current. SLIDESMANIA.COM Electric circuits have switches also that allow people to control the flow of the electric current through the circuit. When a switch is in the on position, there is no gap in the path therefore the circuit is closed and the current can flow. When the switch is turned the other way, it breaks the circuit and stops the flow of the current. SLIDESMANIA.COM SLIDESMANIA.COM SLIDESMANIA.COM How did you identify the objects that use electricity? What are the characteristics of objects that use electricity? SLIDESMANIA.COM