Have you ever wondered how much water is needed to charge an iPhone? Probably not, because charging your phone requires electricity, not water. But, say, if you have a hydraulic generator, you could generate some electricity using only your garden hose. This is exactly what is being done in this video from the YouTube channel The laboratory for action.
Channel owner James Orgil demonstrates the output power of his tuning and how the output voltage increases as the water flow increases. The power supply that comes directly from the generator is an AC power supply, so it connects a full bridge rectifier to the output to convert it to DC. It makes sure that the voltage generated is a maximum of 12V, adjusting the flow to prevent the iPhone from frying.
But if you ever decide to do this at home, you probably need to buy a voltage regulator just to be safe. He then continues to charge his phone to find out how much water it will take to fully charge his phone, and estimates that he will need 528 gallons (2400 liters) of it! If you want to watch the demo, watch the video above.