system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does my charger take less current input and give higher output?

My phone charger says the input is 0.2A and output is 1.2A. How?
gpt
Because current isn't power.

Current can be slid up and down provided you slide the voltage the other way at the same time. Were you to calculate the *power* taken in by the charger - the current x voltage, you'd find it is somewhat more (to account for lost heat) than the output *power*.

Inside the charger is a clever bit of electronics which does the job that used to be done by a transformer. It slices the incoming high-voltage power into bits, letting a slice through as and when needed to keep the output voltage at the required level.