UNIT D ELECTRICAL PRINCIPLES & TECHNOLOGIES. Science 9
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1 UNIT D ELECTRICAL PRINCIPLES & TECHNOLOGIES Science 9
2 LEARNING GOALS Investigate and interpret devices that convert various forms of energy Describe technologies for the transfer and control of electrical energy Identify and estimate (using calculations) energy inputs and outputs for various devices and systems Evaluate the efficiency of energy conversions Describe societal and environmental implications of the use of electrical energy
3 SKILLS GOALS Ask science-based questions Design an experiment when given a question Conduct an investigation Analyze and interpret my qualitative and quantitative data Work collaboratively with my peers
4 ATTITUDE GOALS Show interest in science Appreciate how different ideas from all over the world mix together to bring about understanding Take my time and consider various approaches to investigations, problems and issues Begin to recognize my impact on the environment Work safely in the science classroom and lab
5 FOCUSING QUESTIONS How do we obtain and use electrical energy? What scientific principles are involved? What approaches can we use in selecting, developing and using energy-consuming devices that are efficient and effective in their energy use?
6 CONCEPT 1 VOCABULARY TERMS Energy Chemical energy Thermocouple Electromagnet Commutator Brushes Armature Electromagnetic induction
7 CONCEPT 1 ENERGY Learning Concept Identify, describe and interpret examples of: Mechanical energy Chemical energy Thermal energy Electrical energy Light energy
8 CONCEPT 1 ENERGY Electrical energy is the energy of charged particles Transferred when electrons move from place to place Can be generated from various other types of energy
9 CONCEPT 1 ENERGY Mechanical energy is both the kinetic energy (E k ) and the potential energy (E p ) in a system
10 CONCEPT 1 ENERGY
11 CONCEPT 1 ENERGY Chemical energy is released from a chemical reaction Dry cells electrolyte chemicals are in a paste Wet cells uses a liquid electrolyte
12 CONCEPT 1 ENERGY Thermal energy is the total kinetic energy of all the particles in a substance Most energy is lost as heat
13 CONCEPT 1 ENERGY A thermocouple is a temperature sensor at the junction between two different metals Produces a voltage proportional to the temperature difference between the hot and cold wires
14 CONCEPT 1 ENERGY Incandescent light bulbs require enough electrical energy to make a piece of metal glow brightly yet not get so hot it melts and breaks Resistance causes it to heat up and give off light
15 CONCEPT 1 ENERGY Learning Concept Investigate and describe evidence of energy transfer and formation
16 CONCEPT 1 ENERGY You can use various devices to transform electricity into other forms of energy Examples of Devices that Convert Energy Input Energy Device Output Energy Electrical Toaster Thermal Chemical Electrical Chemical Flashlight Blender Battery-operated clock
17 CONCEPT 1 - ENERGY While a thermocouple converts thermal energy into electrical energy, other devices do the opposite Ex. Heaters, ovens The energy from the electrical charges is transferred to the atoms of the heating elements The heating elements warm up and heat the oven
18 CONCEPT 1 - ENERGY Learning Objective Construct, use and evaluate devices for transforming Electrical energy into mechanical energy Electromagnet & motors Mechanical energy into electrical energy Generators
19 CONCEPT 1 - ENERGY Hans Christian Oersted found a compass needle can be affected if passed by a current-carrying wire Indicated a relationship between magnetism and electricity
20 CONCEPT 1 - ENERGY Michael Faraday built a device that used electromagnetic forces Lead to the development of modern motors
21 CONCEPT 1 - ENERGY Electrical energy Mechanical energy Most common device for this conversion is the motor Use an electromagnet to cause mechanical rotation, which can do work
22 CONCEPT 1 - ENERGY Faraday made a significant electrical discover Electromagnetic induction Electrical current can be generated by moving a conducting wire back and forth inside a coil of wire Mechanical energy Electrical energy
23 CONCEPT 1 - ENERGY Science Log Lab Challenge Using the following materials only, build a magnet Nail Wire Battery Paper clips Masking tape
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