Lots of fun to be had with liquid Nitrogen.
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Liquid Nitrogen
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Low Voltage (But High Current)
Low Voltage
One volt can be impressive too. Check out the 533 A current on the clamp meter from this transformer (above). It is a show of power when melting iron strips with low voltage.
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One Watt White LED
One mother of a bright LED (in 2004). This LED (Luxeon Star) is 180,000 mcd and draws 1 watt (350 mA at 3.4 V) and was claimed to be the worlds brightest series of LEDs in 2003.
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