![]() The water pressure at the fire hydrant cannot push a lot of water(current) through the small diameter garden hose (high resistance). If you use a garden hose, then you get very little flow compared to the fire hose (high resistance). If you use a fire hose, you get somewhat less flow because the fire hose restricts the water flow a bit (small resistance). If you open the fire hydrant valve without an attached hose, you will get a lot of water flowing out of the fire hydrant because there is very little resistance to water flow when there is no hose attached. Water flowing out of the fire hydrant can be thought of as current. That pressure can be thought of as voltage. The fire hydrant provides water at a certain pressure, let's say 100psi. One is a fire hose and the other is a garden hose. Imagine a fire hydrant with two attached hoses, each having a nozzle at the end. You cannot compare the three because they are all measurement units for different physical phenomena.Īn Amp is a unit of measurement of electric current.Ī Watt is a unit of measurement of electrical power.Ī Volt is a unit of measurement of voltage. The difference between amps, watts, and volts I'm not sure how to help you with the amps/watts/volts problem - watts = volts * amps if you're talking electricity, but because energy is a much more fundamental physical property than anything electric, watts = force * speed, or torque * rotational speed, or any number of other physical quantities that multiply out to power. So a 1000mA charger will supply up to 1000mA, which means up to 5000mW (or 5W, but I didn't want to make you do all the conversions until the end). USB is (or should be) a fixed 5 volt system. ![]() So the volts and amps don't matter as much, and in the case of the power that's being transferred wirelessly, aren't even in play.įor USB, you can fully specify the power by specifying the current. With a wireless charger it's (hopefully!) safe to assume that the whole chain is reasonably efficient, and in the end what you care about is how much energy is stuffed into your battery, not how many electrons have passed through. The reason for the difference is that it's kind of apples and oranges. ![]()
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