Cells and Simple Circuits

1. Direction of charges in a chemical cell is opposite the direction of electron flow?

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2. A battery is two or more cells connected together?

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3. What is the main principle of selecting a metal plate to be used in a primary cell?

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4. Which of the following statements is correct concerning electrical devices which are connected in series?

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5. Which of the following is not among the maintenance procedures of accumulators?

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6. In a primary cell the most reactive metal will lose electrons and become positive ion?

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7. Which of the following is NOT among the maintenance procedures of an accumulator?

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8. SI UNIT of current is?

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9. What will happen if cell A which has E.M.F of 3.0 V is connected in parallel to another cell which has an E.M.F of 1.5V?

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10. Why are secondary cells called storage cells?

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11. A chemical cell which cannot be renewed once the chemical cells are exhausted is called?

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12. Which of the following is not a conductor of electricity?

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13. How do you prevent short circuiting in a Lead acid accumulator?

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14. Why are metals good conductors of electricity?

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15. Which of the following statements is TRUE about when cells are connected in series?

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16. What is an electric current?

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17. How do you minimize polarization in a primary cell?

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18. What are the effects of polarization in a primary cell?

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19. Which of the following is not a source of electricity?

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20. Semiconductors are materials whose electrical properties lie between conductors and insulators?

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21. Electric current is the rate of flow of charges?

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22. What type of circuit allows charges to move in a complete path?

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23. What type of circuit does not allow charges to move or stops the charges flowing?

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24. Which of the following is not an example of a secondary cell?

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25. In a primary cell the least reactive metal will lose electrons and become negative ion?

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26. Which of the following statements is TRUE about when cells are connected in parallel?

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27. Voltage is directly proportional to current so long as resistance is kept constant?

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28. The MAIN advantage of parallel connection of cells is that current is supplied for a longer time?

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29. How are secondary cells recharged?

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30. Which of the following formulas is used to calculate the amount of current flowing in a circuit given the charge?

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31. What increases Local action?

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32. Why do operations in ships prefer alkaline accumulator over Lead-acid accumulator?

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33. When 2 or more cells are connected such that the positive terminals of one is joined to the negative terminal of another one, they are said to be connected in?

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34. What is the difference between E.M.F and potential difference?

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35. Chemical cells are cells which provide E.M.F as a result of a chemical reaction?

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36. Which of the following is not among the uses of electrical energy?

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37. Define local action?

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38. Cells in parallel connection should have IDENTICAL E.M.F or otherwise one will drain the other?

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39. Materials which allow electric charges to pass through them are called?

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40. Mention 2 defects of a primary simple cell

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41. Why is Graphite a poor conductor of electricity?

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42. Which of the following statements is correct concerning electrical devices which are connected in parallel?

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43. What are the main reasons which cause an open circuit?

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44. Potential difference is measured in volts by an instrument called?

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45. Mention the 2 types of conductors

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46. Why do bulbs connected in parallel light brighter than the ones connected in series?

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47. What is polarization in a primary cell?

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48. When 2 or more cells are connected such that the positive terminal of one is connected to the positive terminal of the other, while the negative terminal of one is connected to the negative terminal of the other; they are said to be connected in?

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49. Which of the following is NOT a disadvantage of the alkaline accumulator over Lead-acid accumulator?

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50. Mention 2 types of circuits?

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51. Why do bubbles accumulate (polarization) around the least reactive metal of primary cell?

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52. How does a depolarizer work?

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53. A chemical cell which can be renewed once the chemical cells are exhausted is called?

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54. What determines the current-carrying capacity in a Lead acid accumulator?

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55. Mention the 2 types of chemical cells

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