Unit D Final Exam Review Name: Date: Reference: read pages 274 – 365 in Science in Action 9 text. What is static electricity? 3 Laws of Electrical Charges a. b. c. Draw a series of diagrams to explain charge separation. Rubbing vinyl strip with wool creates a charge Rubbing acetate strip with cotton creates a charge What is current electricity? 2 Conditions in Order for Electrical Current to Flow a. b. Complete the following chart: Units Symbol Voltage: Current: Resistance: Power: Energy What is the difference between a conductor and an insulator? Diagram of a conductor and insulator (see page 298) Formula Read Electrical Safety Pointers on page 285. Compare and contrast fuses and circuit breakers. What is an electrochemical cell? Define Electrolyte: Electrode: What is the difference between a dry cell and a wet cell? Draw a neat diagram in pencil of a wet cell. Be sure to label all parts. Explain the difference between a primary cell and a secondary cell. What is electrochemistry? 5 Applications of Electrochemistry 1. 2. 3. 4. 5. What is a superconductor? What is a rheostat? Ohm’s Law states that as long as temperature remains constant: a. b. As temperature , resistance A bulb has 12 Ω of resistance in a circuit operated by two 1.5 V cells hooked in series. Calculate the current in the circuit. A tea kettle draws 8 A of current from a 120 V outlet. What is the resistance of the element? Draw a schematic diagram that would have three 1.5 V cells hooked in series and would operate a light and a motor separately. There would also be a master switch to shut everything off. What are the four common forms of energy? a. b. c. d. What is a thermocouple? Label the St Louis Motor. terminals, commutator, brushes, armature, permanent magnet, connecting wire What is the difference between alternating and direct current? What are the two types of transformers? Draw a diagram of each. a. diagram b. diagram An electric fan uses 1140 W of power and has a current of 9.5 A. What is the voltage of the system? A hair dryer uses 980 W of power when plugged into a 120 V outlet. Calculate the resistance of the element in the hair dryer. (hint: you need to use more than one formula THINK about it!!)) A stove has a power rating of 850 W. If you bake a cake for 25 minutes at 350oC, how much will you be charged if the power company charge $0.15 per kWh? Why are systems not 100% efficient? What happens to this “wasted” energy? What is the difference between a renewable and nonrenewable resource? What is flyash? Use the term sustainable or sustainability in a sentence to demonstrate understanding of the term. Which of the following diagrams represents an electric drill that can adjust the speed of the motor and turn it on and off?