system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do usbc devices "pull" just the wattage they need from the charger, or does the charger "push" all the power it can?
gpt
The device sets the amount of current drawn, and the power supply determines the volt-amps allowed for the circuit. Cell phone chargers are often found in multiples of 5 watts (volt-amps = watts).

5 volts at 1 Amp is 5W (slow charger).

5 volts at 2 amps is 10W (fast charger).