what are the purpose of voltage and current in a phone charger? How does it affect charging?
In: Technology
I find the electricity-water analogy useful for these things. Think of voltage as the pressure of the water, and current as the flow rate. In this case, the battery is a tank high up. You let out water from the tank into machinery to make the phone work. To charge the battery, you need to pump water up to it. This requires a certain pressure (voltage). To charge it quickly, you want to send water quickly. This is the current. So the more current, the faster the battery charges. Where this analogy breaks down is the limitations of fast charging. In a battery, if you try to feed it too much current, it will overheat. So the current needs to be carefully managed to flow as much as possible without overheating the battery.
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