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I'm 1000 years in the past with my phone and magical internet. I have built a simple generator, but my phone's battery is getting low and I need to make sure I'm feeding it the proper amperage and voltage. How do I make sure my units are correct?

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I'm 1000 years in the past with my phone and magical internet. I have built a simple generator, but my phone's battery is getting low and I need to make sure I'm feeding it the proper amperage and voltage. How do I make sure my units are correct?	23