Okay, we had a seriously bad science teacher this year, and long story short, we hardly understood anything relating to DC current(she was fired a few days ago).
I understand Ohm's Law:
Working out current from voltage/resistance
Working out resistance from voltage/current
Working out voltage from current*resistance
I understand what current is(I=q/t, flow of electrons in a circuit)
I understand what voltage is(potential difference)
I understand what resistance is(how much a resistor decreases the current)
I understand what wattage is (voltage*current)
I don't fully understand batteries:
Battery x is rated at 5volts, 2500mAH.
Device y draws 5 volts, 5mA. This means that the battery would last 500 hours correct?
Now, device z draws 5 volts, 3000mA. This means the battery would last under an hour correct?
Now circuit d draws 5 volts, 2500mA. The circuit would last 1 hour.
Now take a AC -> DC adapter, it is rated at 12 volts, 1A.
What does that amp in this circumstance refer to?
Is it to work out the maximum resistance that a device plugged in could have?
Would this adapter be working as the battery in a circuit?
Is it refering to the amperage of the full circuit when a device is plugged in?
So, batteries don't output amperage. It changes depending on the voltage/resistance of the device.
Now wattage. Why are some devices rated in watts?
For example my PSU is 600watts.
So it outputs 600watts total over a bunch of 12v, 5 volt and 3 volt cables? It's input is 220V, so the amperage it draws is: 2.7Amps?
Or is that the amperage it outputs?
Thank you if anyone answers these question, I taught myself all of this from countless days of research and questions.