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Name Date Class Electric Charges and Electricity Understanding Main Ideas Study the diagrams below, then answer the following questions in complete sentences. 1. What is the voltage source and what is the conductor in this circuit? ________________________________________________________ ________________________________________________________ 2. What are two ways you could alter the wire to increase the resistance in the electric circuit? __________________________________________________________________________________ __________________________________________________________________________________ 3. Are the negative charges in the doorknob attracted or repelled by the charges in the finger? How can you tell? __________________________________________________________ __________________________________________________________ 4. What do the lines around the finger and doorknob represent? ______________________________________________________________________________ ______________________________________________________________________________ Building Vocabulary Match each term with its definition by writing the letter of the correct definition in the right column on the line beside the term in the left column. 5. electric current a. a complete, unbroken path through which electric charges can flow 6. insulator b. material through which charge cannot easily flow 7. voltage c. the difference in electrical potential energy per charge between two points in a circuit 8. resistance d. the continuous flow of electric charges through a material 9. conductor e. the measure of how difficult it is for charges to flow through a material 10. electric circuit f. material through which charge can easily flow Name Date Class Electric Charges and Electricity Write the letter of the correct answer on the line at the left. 1. A region around a charged object where the object’s electric force is exerted on other charged objects is an electric A field B outlet C socket D power plant 2. A B C D Atoms contain charged particles called protons, neutrons, and electrons protons and electrons protons and neutrons electrons and neutrons A B C D In static electricity, charges flow continuously flow intermittently build up in an atom build up on an object 3. 4. A B C D 5. The unit for the rate of current is the ampere volt ohm joule Which of the following does not determine the resistance of a wire? A temperature B diameter C length D color 6. A B C D All electrical devices contain electric acid gears circuits motors Fill in the blank to complete each statement. 7. The amount of charge that passes through a wire in a given period of time is the rate of electric . 8. The electrons in conductors move about electrons in insulators. freely than the 9. Charges that are different ______________ each other. 10. An electric field gets _____________________ the closer it is to the charge. 11. an object. is the measure of how difficult it is for charges to flow through 12. is the difference in electric potential energy per charge between two points in a circuit.