3 ms·
Amperage kills you, but it takes voltage to get to your heart first. 5VDC across your body's resistance (somewhere around 1MΩ in normal conditions) is nowhere
by kec 9y ago
Amperage kills you, but it takes voltage to get to your heart first. 5VDC across your body's resistance (somewhere around 1MΩ in normal conditions) is nowhere near enough current to feel, let alone harm you.
- klodolph 9y agoRight, and the charger is plugged into the wall which provides 220VAC. The cheap chargers are unsafe because they don't have enough clearance between the high voltage and low voltage sides of the circuit, so the isolation can fail and energize the USB port with 220VAC, for example. This is a well-known failure mode of cheap phone chargers, and it should be obvious why these shortcuts are illegal in most countries. Teardowns of cheap USB chargers online explain what I'm talking about, for example, https://www.youtube.com/watch?v=wi-b9k-0KfE https://www.youtube.com/watch?v=wi-b9k-0KfE