Unijunction Transistor, Modulates an AC waveform

How does a Uni-Junction transistor creates a charging/discharging effect and outputs a AC waveform or bi polar waveform to cause a light to blink?

A Uni-Junction Transistor has negative resistance, what is a negative resistance? and how does this work?

The Uni-Junction transistors Emitter needs a charging path and an discharging path that goes to the Emitter?

A Uni-Junction Transistor acts like a damaged transistor to me, it breaks down when the voltage on the emitter is low trigger threshold and expands when the voltage on the emitter is at a trigger threshold. This creates a bi polar ramping waveform or an oscillation?

The Emitter of a UniJunction Transistor has 2 trigger thresholds, for a low voltage threshold and the other for a high voltage threshold?

How does a Uni-Junction transistor creates a charging/discharging effect and outputs a AC waveform or bi polar waveform to cause a light to blink?

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Its not a bipolar waveform, but the blinking effect is due to . . .. You and me understand the circuit but everybody should because you are posting in a forum, so start with the UJT sawtooth generator circuit diagram.

A Uni-Junction Transistor has negative resistance, what is a negative resistance? and how does this work?

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Negative resistance means reduction in Base1 to Base2 resistance due to Emitter voltage.

The Uni-Junction transistors Emitter needs a charging path and an discharging path that goes to the Emitter?

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The charging path will complete without emitter, but discharge will be through Emitter.

A Uni-Junction Transistor acts like a damaged transistor to me, it breaks down when the voltage on the emitter is low trigger threshold and expands when the voltage on the emitter is at a trigger threshold. This creates a bi polar ramping waveform or an oscillation?

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Yeah, That way.

The Emitter of a UniJunction Transistor has 2 trigger thresholds, for a low voltage threshold and the other for a high voltage threshold?

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High thresold is Voltage and low thresold is current.

Negative resistance means reduction in Base1 to Base2 resistance due to Emitter voltage.

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So when there is a Voltage on the Emitter , base1 to Base2 have a negative resistance?

Does Negative resistance mean low impedance or like a low ohm resistor?

The charging path will complete without emitter, but discharge will be through Emitter.

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So the Charging path doesn't PASS through the emitter to base1 or Base2?

Only the Discharging Path Passing through the emitter to base2?

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so start with the UJT sawtooth generator circuit diagram.

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I'm not sure how a UJT creates a sawtooth waveform? from emitter to base#2? or from Base#1 to Base#2

How does it create a sawtooth waveform , it's the emitter and base , negative resistance?

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It's the Negative resistance expanding and collapsing from the emitter to base#2?