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Pearson-Anson effect
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Everything about The Pearson-anson Effect totally explained

The Pearson-Anson effect, discovered by Stephen Oswald Pearson and Horatio Saint George Anson, is the phenomenon of an intermittent electrical current through an electrical load exhibiting negative resistance (for example, a neon lamp). In Pearson and Anson's original circuit, the load and a capacitor are connected in parallel and both are connected to a series circuit consisting of a high resistance and voltage source. When a neon lamp serves as the load, the neon exhibits negative resistance. That is, once the voltage across the lamp exceeds a critical value, a decrease in the voltage across the lamp causes an increase in the current through the lamp. In the Pearson-Anson circuit, this causes the capacitor to quickly discharge through the neon lamp as soon as the voltage across the capacitor has reached the lamp's critical voltage. The current through the resistor is too low to sustain conduction in the lamp, so, instead, the current recharges the capacitor until the cycle repeats. The circuit therefore exhibits a low-frequency oscillation, during which the lamp flashes each time it conducts.

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