Volts and Amps

[Guest]

19 minutes ago, Mudface said:

The polarity on the adapter should match whatever it is you're charging- it'll either be positive or negative (think of popping a battery in the right way round).

 

There are some details here- https://www.groovypost.com/howto/choose-right-power-adapter-charger-phone-laptop/

 

Reading an AC/DC Adapter Label

If the manufacturer was smart enough (or compelled by law) to include the DC output on the label, you are in luck. Look at the “brick” part of the adapter for the word OUTPUT. Here, you’ll see the volts followed by the direct current symbol and then the current.

The DC symbol looks like this: 

To check the polarity, look for a + or – sign next to the voltage. Or, look for a diagram showing the polarity. It will usually consist of three circles, with a plus or minus on either side and a solid circle or C in the middle. If the + sign is on the right, then the adapter has positive polarity:

If there is a – sign on the right, then it has negative polarity:

Next, you want to look at your device for the DC input. You’ll usually see at least the voltage near the DC plug receptacle. But you also want to make sure the current matches, too.

You might find both the voltage and the current elsewhere on the device, on the bottom or inside a battery compartment cover or in the manual. Again, look for the polarity, by either noting a + or – symbol or the polarity diagram.

Remember: the input of the device should be the same as the output of the adapter. This includes polarity. If the device has a DC input of +12V / 5.4A, get an adapter that has a DC output of +12V / 5.4A. If you have a universal adapter, make sure it has the proper current rating and that you choose the correct voltage and polarity.

No wonder most electrical products have to be provided with a power plug! The product I have is a small hdmi splitter that has a micro USB cable and all the booklet says is plug it into a 5v 1a dc input. There's no pictures in the booklet, on the box or on the product. 

 

Not sure I trust it but it is a good eye opener to see how electricity works. 

[Bjornebye]

 

 

 

[Chip Butty]

2 hours ago, Pidge said:

Watt are you on about?

There is a potential difference to watt was being talked about and watt currently is. 

[Evelyn Tentions]

14 minutes ago, Shooter in the Motor said:

No wonder most electrical products have to be provided with a power plug! The product I have is a small hdmi splitter that has a micro USB cable and all the booklet says is plug it into a 5v 1a dc input. There's no pictures in the booklet, on the box or on the product. 

 

Not sure I trust it but it is a good eye opener to see how electricity works. 

That makes life easier. Don't worry about polarity or anything.

It wants to be plugged in to a phone charger or a USB  hole on a computer/laptop

 

[cloggypop]

Best thread of 2020 so far. 

[Mudface]

1 hour ago, cloggypop said:

Best thread of 2020 so far. 

It's good to have a positive, energetic thread to start the year.