Cells and Simple Circuits

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

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

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3. Mention 2 defects of a primary simple cell

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4. Mention 2 types of circuits?

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5. What increases Local action?

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

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7. Define local action?

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

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9. Mention the 2 types of chemical cells

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

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11. Why are secondary cells called storage cells?

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

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

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

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15. What is polarization in a primary cell?

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

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

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19. Mention the 2 types of conductors

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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37. How are secondary cells recharged?

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38. Why is Graphite a poor conductor of electricity?

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

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

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

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42. 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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43. SI UNIT of current is?

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

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

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

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

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

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

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

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52. How does a depolarizer work?

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53. What is an electric current?

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54. Why are metals good conductors of electricity?

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

Question 55 of 55