By dividing the power in watts by the power factor of the load.
A 15 amp 125 volt outlet is a household outlet.
Milli volt is one thousandth of a Volt and Milli amp is one thousandth of an Amp. Volt and Amp measure two different things and are not really comparable. Over simplified, here is how it works. Volt measures the 'pressure' that causes current to flow. Current flow is measured in Amps and depends on the how much resistance the 'pressure' has to overcome. Higher the resistance, lesser the current (Amp) for same pressure (Volt)
yes
Yes, you can.
A 1-amp adaptor can not be used for equipment that draws more than 1 amp. It is not clear from the question which part of your system is 12 v and which is 20 v.
20 amp on a 12 volt system
There is no 115 volt, 100 amp, or 400 amp switch on the dash of a 2008 Tacoma.
No. If you connect two 12 volt batteries in series(positive to negative) to make 24 volts, you will have 100 amp hours. If you connect two 12 volt batteries in parallel(pos to pos, neg to neg) you will stay at 12 volts but have 200 amp hours
A
Amp, Amperes is current. Volt, and any variation, is tension. There's no direct translation between them.
Electrically yes it is safe but the pin configuration will be different.
Yes, only it will take the 1.2 amp a little longer to fully charge a battery than a 1.5 amp charger.