PS 7.8.1 – 7.8.3 TEST 8TH GRADE SCIENCE

ELECTRIC CURRENT IS MEASURED IN ______. VOLTS B. CIRCUITS C. AMPERES D. OHMS 2. VOLTAGE DIFFERENCE IS MEASURED IN ______. 3. A CLOSED PATH THAT ELECTRIC CURRENT FOLLOWS IS A _________. VOLT B. CIRCUIT C. AMPERE D. OHM 4. THE NET MOVEMENT OF ELECTRIC CHARGES IN A SINGLE DIRECTION IS AN _________. ELECTRIC CIRCUIT B. ELECTRIC CURRENT C. DRY CELL D. WET CELL

FUSE B. BREAKER C. BATTERY D. OHM 5. A _____ CAN PROVIDE THE VOLTAGE DIFFERENCE THAT IS NEEDED TO KEEP CURRENT FLOWING IN A CIRCUIT. FUSE B. BREAKER C. BATTERY D. OHM 6. ONE ELECTRODE IS THE CARBON ROD, AND THE OTHER IS THE ZINC CONTAINER. WET CELL B. DRY CELL C. LEAD ACID 7. 2 CONNECTED PLATES MADE OF DIFFERENT METALS OR METALLIC COMPOUNDS IN A CONDUCTING SOLUTION. A. WET CELL B. DRY CELL C. LEAD ACID

8. MOST CAR BATTERIES ARE ___ BATTERIES. DRY CELL B. WET CELL C. LEAD ACID 9. THIS CURRENT HAS ONLY 1 LOOP TO FLOW THROUGH. THEY ARE USED IN FLASHLIGHTS. OPEN CIRCUIT B. RESISTANCE C. SERIES CIRCUIT D. OHM 10. _____ IS THE TENDENCY FOR A MATERIAL TO OPPOSE THE FLOW OF ELECTRONS, CHANGING ELECTRICAL ENERGY INTO THERMAL ENERGY AND LIGHT. A. RESISTANCE B. SERIES CIRCUIT C. OHMS LAW

OPEN CIRCUIT B. OHM’S LAW C. SERIES CIRCUIT D. PARALLEL CIRCUIT 11. THE CURRENT IN A CIRCUIT EQUALS THE VOLTAGE DIFFERENCE DIVIDED BY THE RESISTANCE. OPEN CIRCUIT B. OHM’S LAW C. SERIES CIRCUIT D. PARALLEL CIRCUIT 12. RESISTANCE IS MEASURED IN _______. OHMS B. FUSES C. WATTS D. CELLS 13. A BURNED OUT BULB IN THIS CIRCUIT CAN CAUSE THE WHOLE STRING OF LIGHTS TO GO OUT. A. DRY B. PARALLEL C. SERIES D. OPEN

FUSE BOX B. DRY CELL C. OPEN CIRCUIT D. SERIES CIRCUIT 14. THE MAIN SWITCH AND CIRCUIT BREAKER, OR THE ___________ SERVES AS AN ELECTRICAL HEADQUARTERS FOR YOUR HOME. FUSE BOX B. DRY CELL C. OPEN CIRCUIT D. SERIES CIRCUIT 15. THIS CIRCUIT CONTAINS 2 OR MORE BRANCHES FOR CURRENT TO MOVE THROUGH. OPEN B. FUSE C. PARALLEL D. SERIES 16. THIS CONTAINS A SMALL PIECE OF METAL THAT MELTS IF THE CURRENT BECOMES TOO HIGH. A. WATT B. CIRCUIT C. OHM D. FUSE

C. OVERHEATING D. CIRCUIT ACTION C. OHM BREAKER D. PARALLEL CIRCUIT 17. TOO MANY APPLIANCES IN USE AT THE SAME TIME IS THE MOST LIKELY CAUSE_____OF THE CIRCUIT. MORE POWER B. WATTAGE C. OVERHEATING D. CIRCUIT ACTION 18. A ____________ CONTAINS A PIECE OF METAL THAT BENDS WHEN THE CURRENT IN IT IS SO LARGE THAT IT GETS HOT. CIRCUIT BREAKER B. FUSE C. OHM BREAKER D. PARALLEL CIRCUIT

19. THE UNIT FOR POWER IS THE ______. OHM B. VOLT C. WATT D. CELL 20. THE RATE AT WHICH ELECTRICAL ENERGY IS CONVERTED TO ANOTHER FORM OF ENERGY IS THE _____________________. ELECTRIC POWER B. KILOWATT HOUR C. ELECTRIC OHM D. CIRCUIT BREAKER 21. ELECTRICAL ENERGY USUALLY IS MEASURED IN _____. WATT HOURS B. KILOWATT HOURS C. CIRCUIT HOURS D. FUSE HOURS

A. V = PI B. V = IP C. I = VP D. P = IV 22. WHICH OF THE FOLLOWING EQUATIONS IS USED TO CALCULATE ELECTRIC POWER? A. V = PI B. V = IP C. I = VP D. P = IV 23. ONE KILOWATT EQUALS HOW MANY WATTS? A. 10 B. 100 C. 1000 D. 10,000

ELECTRIC CURRENT IS MEASURED IN ______. C. AMPERES 2. VOLTAGE DIFFERENCE IS MEASURED IN ______. A. VOLTS 3. A CLOSED PATH THAT ELECTRIC CURRENT FOLLOWS IS A _________. B. CIRCUIT 4. THE NET MOVEMENT OF ELECTRIC CHARGES IN A SINGLE DIRECTION IS AN _________. B. ELECTRIC CURRENT

5. A _____ CAN PROVIDE THE VOLTAGE DIFFERENCE THAT IS NEEDED TO KEEP CURRENT FLOWING IN A CIRCUIT. C. BATTERY 6. ONE ELECTRODE IS THE CARBON ROD, AND THE OTHER IS THE ZINC CONTAINER. B. DRY CELL 7. 2 CONNECTED PLATES MADE OF DIFFERENT METALS OR METALLIC COMPOUNDS IN A CONDUCTING SOLUTION. A. WET CELL

8. MOST CAR BATTERIES ARE ___ BATTERIES. C. LEAD ACID 9. THIS CURRENT HAS ONLY 1 LOOP TO FLOW THROUGH. THEY ARE USED IN FLASHLIGHTS. C. SERIES CIRCUIT 10. _____ IS THE TENDENCY FOR A MATERIAL TO OPPOSE THE FLOW OF ELECTRONS, CHANGING ELECTRICAL ENERGY INTO THERMAL ENERGY AND LIGHT. A. RESISTANCE

12. RESISTANCE IS MEASURED IN _______. 11. THE CURRENT IN A CIRCUIT EQUALS THE VOLTAGE DIFFERENCE DIVIDED BY THE RESISTANCE. B. OHM’S LAW 12. RESISTANCE IS MEASURED IN _______. A. OHMS 13. A BURNED OUT BULB IN THIS CIRCUIT CAN CAUSE THE WHOLE STRING OF LIGHTS TO GO OUT. D. OPEN

14. THE MAIN SWITCH AND CIRCUIT BREAKER, OR THE ___________ SERVES AS AN ELECTRICAL HEADQUARTERS FOR YOUR HOME. FUSE BOX 15. THIS CIRCUIT CONTAINS 2 OR MORE BRANCHES FOR CURRENT TO MOVE THROUGH. C. PARALLEL 16. THIS CONTAINS A SMALL PIECE OF METAL THAT MELTS IF THE CURRENT BECOMES TOO HIGH. D. FUSE

17. TOO MANY APPLIANCES IN USE AT THE SAME TIME IS THE MOST LIKELY CAUSE_____OF THE CIRCUIT. C. OVERHEATING 18. A ____________ CONTAINS A PIECE OF METAL THAT BENDS WHEN THE CURRENT IN IT IS SO LARGE THAT IT GETS HOT. A. CIRCUIT BREAKER

19. THE UNIT FOR POWER IS THE ______. C. WATT 20. THE RATE AT WHICH ELECTRICAL ENERGY IS CONVERTED TO ANOTHER FORM OF ENERGY IS THE _____________________. A. ELECTRIC POWER 21. ELECTRICAL ENERGY USUALLY IS MEASURED IN _____. B. KILOWATT HOURS

23. ONE KILOWATT EQUALS HOW MANY WATTS? C. 1000 22. WHICH OF THE FOLLOWING EQUATIONS IS USED TO CALCULATE ELECTRIC POWER? D. P = IV 23. ONE KILOWATT EQUALS HOW MANY WATTS? C. 1000