When replacing a charger, this is easy to determine: it’ll be listed somewhere on the old charger. In your case, the old charger supplied 19 volts, so your replacement must also be 19 volts.

12 Volt 1.5 Amp Worldwide Power Supply (US/EU/UK/AU) Nebra 12 Volt 1.5 Amp Worldwide Power Supply (US/EU/UK/AU)

Power supply efficiency is known as the amount of power actually provided to the internal circuitry, divided by the amount of power drawn from the mains supply. If a PSU is 50% efficient and is required to provide 50 Watts of power, 100 Watts will be drawn from the main supply. The extra 50 W is lost as heat. A 90% efficient PSU would draw 56 W in the same circumstances. What industries can power supplies be used in? Thus, as long as you replace your power supply with one capable of providing as much or more amps than the previous, you’ll be fine. In other words, there is nothing wrong with having a charger capable of providing more amps than needed. Polarity I have a USB 3.0 cable, but if it is an exercise in futility then I’m just wasting money on a fantasy. Particularly when it comes to popular circular power connectors, make sure the expectations match. If the device expects the center connector to be positive and the outer ring to be negative, your power supply’s connector must match. There’s no getting around this. Of course I was excited to do it. My thought was that if the Nintendo car adapter charger steps 12 volts down to 4.6 Volts at 900 mA, then this new cable should step 5 volts down to 4.6 at 900 mA. But it did not work.I would just state the obvious, use the charger that has a normal temperature as long as it is not damaging the device you are charging. The fact that you’ve charged a device with .5A tells me that the device you’re trying to charge will not blowup and the requirement of that device requires at least .5A. But again, without knowing what your charging exactly it can vary with what device you are actually charging. I would recommend you either look for the fine print or google your device’s input power requirements. I have a Nintendo 3ds that requires 4.6 Volts and 900 mA (you might as well say 1 amp). Older Nintendo DS’s required 5 Volts so I was ok cutting the charger cable and making my own USB charger out of it so I can either charge it in the wall or with a portable charger. Company policy is that we do not under any circumstances issue instructions to our couriers to leave deliveries unattended when no one is at the delivery location. Sidestep all those unknowns and make sure to get exactly the right voltage from the start. Amperage

12V AC Adapters | RS 12V AC Adapters | RS

If I knew what kind of resistor I can buy to solder in with a wire that would be about my only option. You really need to look at the device requirements (in this case your power bank – I guess). It is always possible that you have a “lemon” if your charger heats up fast. When I took my multimeter and took a reading on the output of the car adapter from a 5V charger, it was reading 4.14V or 3.8V, and the Nintendo 3DS charger light would blink. Unfortunately the gauge of the USB 2.0 cable is really a high number (meaning that the wires are few and small). I’m thinking I should redo my cable and use a USB 3.0 cable because I think it may be able to handle the Voltage. And here’s the problem: there’s no way to say what’s enough or too much. It varies from device to device. Some may tolerate a wide range of input voltages, while others are extremely sensitive to even the smallest error.Yes. Because a) the voltage matches, and b) the amperage provided is greater than that needed, you can use a 5v-2A charger with a 5V-1A device. Is 500ma the same as 0.5 A? Most power supplies provide their output on two wires: one labeled (+) or positive, and the other (-) or negative. Which wire is which is referred to as polarity. Here’s the catch: just because the physical plug fits into your device does not mean that the polarity is correct. Example of a polarity indicator. (Image: Three-quarter-ten, CC BY-SA 3.0, via Wikimedia Commons) No, amps do not have to match, but the power supply or charger must be able to supply enough amps as required by the device being powered or charged. In practical terms, that means the amperage rating of a power supply or charger must match or exceed that required by the device it is connected to. Does more volts mean more amps? If you look closely at the small print on many power supplies, you’ll see they’re rated for anything from 100 to 250 volts. This means most can work worldwide with nothing more than an adapter to account for the physical plug differences — no voltage transformer needed.