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Retake review for Test-: GLE 9.2.1, 9.2.2 & 9.2.3- Electricity (Chapter 7) 9.2.1- Electric Charge 1. Which of the three subatomic particles are able to be removed from an atom, and flows as the current in a circuit? _______________ 2. Static electricity is the ____________________ of excess ______________ ____________ on an object. 3. How do charges interact with one another? (draw in arrows to show the force) Like charges _____________ ex. + + Opposite charges ___________ ex. - - 4. A conductor of electricity is a material which is _______________ at allowing ______________ to flow. 5. An insulator of electricity is a material which is _______ ______________ at allowing ________________ to flow. 9.2.2- Electric Current 6. Electric current is a measure of the amount of _________________ flowing in a circuit. The symbol for current is: R, I or V Current is measured in: _________ 7. The voltage difference in a circuit is a measure of the ________________ per _____________ of electricity flowing in a circuit. The symbol for voltage difference is: R, I or V Voltage difference is measured in: _________ 8. The Resistance in a circuit is a measure of how much the flow of ________________ in a circuit is _____________. The symbol for resistance is: R, I or V Resistance is measured in: _________ 9. How do each of the following characteristics impact a material’s resistance? Temperature- Length- Thickness (diameter)- 10. Ohm’s law states that as the _________________in a circuit _______________ the current will decrease. 11. What is the voltage difference in a circuit with a resistance of 30 ohms, if the current in the circuit is .5 A? 12. What is the resistance of a light bulb if it is plugged into a 9 V circuit with a .2 A current? 13. What is the current in a circuit if there is 120 V and 300 ohms of resistance? 9.2.3- Electrical Energy 14. Draw a series circuit: 15. What is the disadvantage of a series circuit? 16. Draw a parallel circuit: 17. Which of the two types of circuits are found in most household wiring?______________ 18. The purpose of a fuse or a circuit breaker is to ________________ an _________________ circuit to prevent ________________________.