Capacitors with a series neon bulb on A.C. and D.C.

• D+0+18

diagram for demo

Capacitors with a series neon bulb on A.C. and D.C. Throw knife-switch A to the left to put 120 VDC. across the series capacitor and neon bulb circuit. The breakdown voltage of the neon in the neon bulb is about 70 volts, but only one of the two semi-circular electrodes in the bulb glows briefly. Throw Switch A to the right to put 120 VAC. across the capacitor and neon bulb circuit. Now both electrodes of the neon bulb glow. In both the DC and AC cases, the regular 15 watt tungsten filament lamp glows continuously. Short the capacitors before putting away. CAPACITANCE.

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