Grade 8/9 Science Study Guide Unit 3: Electricity Key Terms Static Electricity Current Electricity Neutral Positive charge Negative charge Electric discharge Potential energy Electric potential difference Coulomb Electric potential energy Volt Electrochemical cell Battery Electrode Electrolyte Electric current Ampere Conductor Resistor Ammeter Voltmeter Opened switch Closed switch Circuit diagram symbols Electrical resistance Ohm Ohm’s Law Series circuit Parallel circuit Fuse Circuit Breaker Grounding Terminals Electrical energy Joule Watt EnerGuide Electrical generator Transformer 1. How are objects charged and how can the charge on objects change? 2. What are the 3 laws of electric charge? 3. Identify 3 pieces of technology that have resulted from our knowledge of static electricity. How do they use static electricity to work? 4. Identify 3 careers related to electricity and 3 reasons why electricity is an important part of our everyday lives 5. How does an electrochemical cell produce an electric charge? 6. List and describe the 4 parts of an electric circuit and how they work together to form a circuit. 7. List and describe the 4 factors that affect resistance in a circuit. 8. Your electrician has decided to set up your outdoor Christmas lights on a series circuit, similar to the set of lights below. Answer the following questions: A) Describe the amount of current that is passing through points A, B and C if there is no resistor added to the circuit B) How does adding a resistor affect the current of the entire circuit? C) How does removing load B affect loads A and C? D) Lets say that the circuit could handle approximately 12V. Describe how each load may share the voltage. 9. Your houses are wired in parallel similar to the following diagram. Answer the following: A) Describe the amount of voltage each load has. B) How will the current change if we put different resistors on each load? C) How is the circuit affected if we remove one of the loads? 10. What 3 factors affect the cost of electrical energy? Explain each. 11. What is an EnerGuide label and what are some of the regulations associated with them in Canada? 12. List and describe the 3 types of electrical generating stations. 13. How is electrical energy transmitted? 14. List and describe 3 alternate sources of electrical energy. 15. What factors could influence the development of alternate energy sources? 16. Using the diagram shown below, explain what happens to Object A and B after they are rubbed together. Be sure to indicate the objects current charges and charges after rubbing. (Note: Object B has a strong attraction for electrons) + _ + _ + + _ + _ + _ + _ + _ _ + _ + _ Object A (fur) Object B (vinyl) * The practice worksheet calculating power, energy consumption, Ohm’s Law, efficiency and cost to consumers is also for your test.
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