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I review the Uniroi UC305 DC laboratory Power supply 0-30V 0-5A and I made some experiments with electricity.
I bought it on Amazon.

Adjustable DC Power Supply: Variable voltage output: 0-30 volts; Variable current output: 0-5 amp; 3-digit LED Display accuracy: 0.01 V and 0.001A. Widely used to testing of production line, electrical maintenance, chargeing of accumulators, and scientific research teaching.
Constant-Current & Constant-Voltage Operation Mode: The two operation modes will switch over automatically as the load changes. There are indicators of the two modes on the Display.
Gift: Comes with 2pcs Alligator Clip Leads (one is with banana plug, one is with spade lugs), 1pc Input Power Cord. Great for using in home, labs, and schools.
Multiple Safety Protections: Features current-limiting protection, thermal protection, voltage overload protection, short-circuit protection.
Intelligent Temperature Control: Cooling fan with built-in thermal sensor can automatically cool the power supply, low noise, effectively extend its service life.

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