Here are three formulas to help you understand energy:
· watts=amps x volts
In electricity watts are watts, regardless of if they are AC or DC. On the other hand Amps and Volts must be converted when changing currents from DC to AC and vice versa.
1000w AC is the same as 1000W DC
To convert AC amps to DC amps multiply by ten. 10 Amps AC is 100 Amps DC.
To convert DC amps to AC amps divide by ten. 100 Amps DC is 10 Amps AC.
- Hair dryers can use 1000w 110v AC. Convert the watts to AC amps.(watts/volts=amps) We get 9 AC amps. We can then convert those to DC amps by multiplying by 10. We get 90 DC amps.
- A 27″ LCD TV uses 85w 110v AC. Convert watts to AC amps.(watts/volts=amps) We get .78 AC amps. Multiply by 10 to get DC amps and we have 7.8 DC amps.
- iPhone 6 uses 12w 110v AC to charge. Convert watts to AC amps.(watts/volts=amps) We get .109 AC amps. Multiple by 10 equals 1.09 DC amps.
Using labels on appliances is the easiest way to determine how much energy they use when in operation.