Revision Quiz 35
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  1. If an atom is uncharged what can you say about the numbers of protons and electrons? (lesson 35a)
  2. a) Like charges -----. b) Unlike charges -------. (35a)
  3. What happens when you rub a ruler with a cloth, and the ruler becomes positively charged? (35a)
  4. A flow of e-------- is called a current. A current is measured in units of a------ , using an a------. (35b)
  5. Draw 2 circuits to show the difference between series and parallel circuits. Use one cell and 2 bulbs in each circuit. (35b,c)
  6. What do you find if you put an ammeter at different places in a series circuit? (35b)
  7. a) A conductor has a --- resistance. b) An insulator has ---- resistance. (35b)
  8. If you add extra bulbs to the series circuit shown in question 5, what happens? (35b)
  9. If you add extra cells to a series circuit shown in question 5, what happens? (35b)
  10. To measure the voltage across a bulb, a v-------- is connected in p------- with the bulb. (35c)
  11. Sketch the shape of the field round a bar magnet. (35d)
  12. a) Like poles -----. b) Unlike poles -------.
  13. What is the shape of the field round a coil when current is flowing through it ? (35d)
  14. State 3 ways to increase the strength of an electromagnet. (35e)
  15. Name some uses of electromagnets. (35e)

ANSWERS

  1. The number of protons (+) is equal to the number of electrons (-).
  2. a) repel. b) attract.
  3. Some electrons (-) have moved from the ruler (so it is positive) and moved on to the cloth (so it is negative).
  4. Electrons, amperes (amps, A), ammeter.
  5. See your text book.
  6. The current is the same at every place in a series circuit.
  7. a) low. b) high.
  8. There is more resistance, the current is less and the bulbs are less bright.
  9. The electrons have more energy, there is more current and the bulbs shine more brightly.
  10. Voltmeter, parallel.
  11. See your text book.
  12. Repel, attract.
  13. The same as a bar magnet - see your text book.
  14. 1. Increase the number of turns on the coil. 2. Increase the current. 3. Use an iron core.
  15. In scrap-yards, door-bells, relays, circuit-breakers, loudspeakers, motors.