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JSSS Teacher support material INVESTIGATING ELECTRIC CIRCUITS OP 49 - 53 Investigation 1 The effect on current of adding bulbs in a series circuit Apparatus 60 mA bulbs, 6 V battery/ power supply unit, switch, leads, ammeter 1. Build the circuit shown in the diagram. Ammeter A Switch Bulb Battery 2. Close the switch. Record the current. _______________________________________________________________________ 3. Predict the value of the current if you place a second bulb in series in this circuit _______________________________________________________________________ 4. Build the circuit and test your prediction. Record the current. _______________________________________________________________________ A Ammeter Ammeter Bulb 1 Switch Switch Bulb 2 Battery Battery 5. Was your prediction correct? Explain. ________________________________________ _______________________________________________________________________ -1- JSSS Teacher support material Investigation2 Measuring voltages in a parallel circuit Apparatus 60 mA bulbs, 6V battery / power supply unit, switch, leads, voltmeter 1. Build the circuit shown in the diagram. Bulbs connected in this way are said to be in parallel. Switch Battery Bulb 2 Bulb 1 V Voltmeter Fig 3 2. Close the switch. What do you notice about the brightness of the bulbs? _______________________________________________________________________ 3. Gently unscrew bulb1. What effect, if any, does this have on the brightness of bulb 2? _______________________________________________________________________ 4. Replace bulb 1 and gently unscrew bulb 2. What effect, if any, does this have on the brightness of bulb 1? _______________________________________________________________________ _______________________________________________________________________ 5. Replace bulb 2. Measure and record the voltage across the battery. __________________ 6. Predict the voltage reading across bulb 1 and explain your prediction. _______________________________________________________________________ _______________________________________________________________________ -2- JSSS 7. Teacher support material Predict the voltage reading across bulb 2 and explain your prediction. _______________________________________________________________________ _______________________________________________________________________ 8. Measure and record the voltages across both bulbs. Vbulb1 = _______________ 9. Vbulb2 = ____________________ If you predicted incorrectly, can you now explain your results? _______________________________________________________________________ _______________________________________________________________________ -3- JSSS Teacher support material Investigation 3 Measuring currents in a parallel circuit Apparatus 60 mA bulbs, 6 V battery / power supply unit, switch, leads, ammeter 1. Build the circuit shown in the diagram. (bulbs in parallel). A Ammeter Switch Battery Bulb 2 Bulb 1 Fig 4 2. Close the switch. 3. Measure and record the current from the battery: _______mA. 4. Would you get the same reading if you placed the ammeter on the other side of the battery? ________________________________________________________________ If you are unsure check it out. 5. On the circuit diagram mark the position with an X where would you place the ammeter to measure the current in bulb 1? _______________________________________________________________________ 6. Predict what current you would expect in bulb 1. _______________________________________________________________________ 7. Place the ammeter in the correct circuit position to test your prediction. -4- JSSS 8. Teacher support material Predict what current you would expect in bulb 2 and state why. _______________________________________________________________________ 9. Place the ammeter in the correct circuit position (marked with a Y) to test your prediction. 10. Explain why your prediction was either correct or incorrect. _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ 11. Add another bulb in parallel and predict the total current in the circuit. Test and record your prediction. _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ -5-