EXPERIMENTAL INVESTIGATION 30.1 Are bulbs brighter when connected in series or parallel?
Equipment Wires 2 power supplies
Method
1. Set up the apparatus for the two circuits shown in Fig. 30.13.
2. Close the switches in each circuit and set the power supply to 5 V.
3. Note the brightness of each set of bulbs and record your observations.
Switch Power supply
SAFETY • Be careful of sharp ends on the wires.
• Do not set the power supply too high (check with your teacher before turning circuit on).
Switch Power supply 6 bulbs 2 switches
Bulbs
Bulbs AB :Fig. 30.13 Circuit diagrams for (A) bulbs in series and (B) bulbs in parallel j Go to page 88 of your Experimental Investigations Log to write up this investigation.
EXPERIMENTAL INVESTIGATION 30.2 How can we measure current?
Equipment Wires Power supply Ammeter
Method
1. Set up the apparatus for the circuit shown in Fig. 30.14. Note: the ammeter is connected in series.
2. Close the switch.
3. Adjust the power supply to increase the power supply value.
4. Record your results.
SAFETY • Be careful of sharp ends on the wires.
• Do not set the power supply too high (check with your teacher before turning circuit on).