Where to connect a meter to measure lamp voltage.
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Where to connect a meter to measure lamp current.
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How to make the current adjustable, so that multiple values may be tested and plotted.
Additionally, the students must identify what voltage/current ranges will be necessary to test a gas-discharge lamp. Notice the high-voltage power source shown in the schematic diagram. Students may ask "How high must this voltage be?" upon seeing the schematic in the answer. Don't tell them outright. Rather, have them do some research and report the next day on typical lamp voltages!