They transform most usually voltage or current. Your phone charger is a transformer that transforms 230/110 Volts into probably 5 Volts to charge your phone.
Volts. 12.6 volts = Full Charge 12.4 volts = 75% Charge 12.2 volts = 50% Charge 12.2 volts = 25% Charge
12.6 volts = 100% Charge 12.4 volts = 75% 12.2 volts = 50% 12.0 volts = 00%
How many volts woud it take to charge a laptop
A fully charged 12 volt automobile battery will read 12.6 volts with the engine not running and 13.5 to 15.5 volts with the engine running. It will read 12.4 volts with a 75% charge, 12.2 volts with a 50% charge and 12.0 volts indicates a 25% charge.
100% charge = 12.6 volts 75% charge = 12.4 volts 50% charge = 12.2 volts 25% charge = 12.0 volts
Your question needs clarification. Car battery, Cell phone battery, camera battery, etc. Question was posted in car batteries category. You can check it with a digital volt meter car not running. Set the meter to 20 volts DC. Here is what you will see. 12.6 volts = 100% charge 12.4 volts = 75% charge 12.2 volts = 50% charge 12.0 volts = 25% charge
156 and 29.1
24 Volts.
12.6 volts at 100% charge 12.4 volts at 75% charge 12.2 volts at 50% charge 12.0 volts at 25% charge
Volts
12.6 volts 100% charge 12.4 volts 75% charge 12.2 volts 50% charge 12.0 volts 25% charge Any less and the battery is essentially dead.