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1. Kim wanted toast for breakfast. When she turned on the toaster switch, electricity was transformed into what type of energy? A. B. C. D. 2. sound and heat energy magnetic and light energy light and heat energy heat energy Look at each picture. Decide if the bulb would be on or off. _____________ _____________ _____________ Add one wire to the correct location to complete each circuit. - + _____________ 3. Bill and Jenny put together a circuit, but the bulb did not work. Tell two things they can check to try to fix the circuit. 4. David and Meg made a circuit that did not light. Look at the picture. Explain what needs to be changed to make the bulb light. 5. Here is a picture of a circuit. Using the symbols for the battery, the bulb, and the wire listed below, draw a circuit diagram for this circuit. Bulb Battery Wire 6. Copper wire in a circuit _____________________ electricity. A. B. C. D. insulates resists conducts repels 7. Read each item. Write it under the correct heading. marble paper clip plastic button chalk Insulator aluminum foil nail Conductor 8. Study each picture. Label each circuit as series or parallel. 9. Ann’s mother bought some new lights for the Christmas tree. One bulb stopped working, but all the other bulbs continued to light up. What kind of circuit was there in the string of lights? A. B. C. D. series parallel double open 10. Write 2 safety rules to follow when using electricity. 11. Look at the picture below. Explain what will happen when the boy enters a dark room and flips the light switch. What type of energy will be created? 12. Circle the complete circuit and explain what makes it a complete circuit. Circuit A Circuit B 13. A useful device for opening or closing a circuit is ________________________. A. B. C. D. an insulator a battery charger a switch conductor 14. Does the following circuit diagram show a complete circuit? Justify your response. 15. Give two ways your teacher uses electricity in the classroom. Use the following diagram to answer question 17. Bulb 1 6 Volt Battery Bulb 3 Bulb 2 16. What will occur when the switch is closed? A. B. C. D. 17. Only Bulb 1 will light up. No bulbs will light up. Only Bulb 1 and Bulb 3 will light up. Bulb 1, Bulb 2, and Bulb 3 will light up. This table shows the results of a student’s investigation. Group A paper plastic straw marble rubber Group B paper clip copper wire iron nail metal screen What criteria did the student use to classify the materials? A. B. C. D. conductor/insulator series/insulator insulator/conductor conductor/resister 18. The following diagrams show a flashlight circuit with a battery and a bulb connected by wires to various substances. In which diagram will the bulb light? Diagram A Bulb Air Diagram B Bulb iron nail Diagram C Bulb plastic button Diagram D Bulb rubber block A. B. C. D. Diagram Diagram Diagram Diagram A B C D Identify each of the statements as qualitative observation, quantitative observation, prediction, or inference. 1. An electromagnet that uses a AA battery is weaker than one that uses D battery. 2. The wire coils are in the shape of a spiral. 3. We had ten wraps of the wire on our electromagnet. 4. If we add more wraps, the electromagnet will be stronger. 5. The battery is in the shape of a cylinder. 6. The motor in a small toy stopped working. The battery probably went dead. Identify each of the following as manipulated variable, responding variable, or controlled variable. 7. Three “D” batteries were used in each electromagnet. 8. Three different sized nails were used. 9. My electromagnet with the small nail picked up 3 paper clips. 10. We wrapped the nail 10 times for each trial. 11. On our third set of trials, the iron core had 30 coils of wire around it. 12. An electromagnet for a large machine would probably have thousands of coils of wire. 13. The paper clips used in the trials weigh approximately 1 gram each. 14. When I go home I will probably try this experiment using more coils to see if the electromagnet continues to get stronger. 15. The silver paper clips are shiny. 16. The electromagnet was probably discovered by someone trying to find new ways to use electricity. Identify each of the following as manipulated variable, responding variable, or controlled variable. 17. The number of wraps or coils on the iron core changed as we conducted our experiment. 18. We used three D batteries for each electromagnet. 19. Each team had to use the same size and type of paper clips in this investigation. 20. The nail wrapped 20 times was able to pick up 7 paper clips. 1. Complete the chart by placing the following items under the correct heading: iron nail, penny, wooden ruler, plastic cup, rubber ball, aluminum can, paper clip, chalk, iron filings Magnetic 2. Non-Magnetic Your teacher asks you to create an electromagnet. List what materials you would need. Draw how you would put these materials together to make an electromagnet. Label your drawing. Materials needed: Drawing with Labels: 3. The north pole of one magnet is facing the south pole of another magnet. The two magnets will _______________. A. B. C. 4. Electromagnetism is _______________. A. B. C. D. 5. attract each other repel each other have no effect on each other magnetism magnetism magnetism magnetism by by by by electrical storms. a large magnet. an electrical current. a ring magnet Tom has two magnets. On one of the magnets, the south and north poles are labeled. Explain how Tom can determine the north pole and the south pole on the other unlabeled magnet. N 6. produced produced produced produced S ? ? Which of the following will increase an electromagnet’s strength? A. B. C. D. using a shorter wire increasing the number of batteries decreasing the number of batteries decreasing the number of coils 7. Explain the difference between a magnet and an electromagnet? 8. Explain which locations on the bar magnet would have the greatest magnetic strength. 9. Which set of magnets will be attracted to each other? A. N N B. N S C. S S D. N W 10. Andrew lost the tiny metal screw out of his glasses while doing an experiment outside in the sand. Circle which of these tools will do the best job of helping him find the screw? 11. Look at the two electromagnets below. What can you determine about each electromagnet’s strength? A. A. B. C. D. B. Electromagnet A is the strongest and B is the weakest. Electromagnet A is the weakest and B is the strongest. Both electromagnets have equal strength. Neither electromagnet has magnetic strength.