Electrical Power calculator

Calculate power (Watt)

Potential ?5 V (Volt)
Current ?5 A (Ampere)A = C/s
Resistance ?1 Ω (Ohm)Ω = V / A
Active power ?25 W (Watt)rate of energy transfer / W = V * A

Calculate energy (KWh/Joule)

After 2 hours of continuous power usage:

Charge (Ah)10 Ah
Energy (kWh)50 Wh
Energy (Joule)180 MJ
Energy (Calorie)42.99 Mcal

Calculate capacity (mAh/Wh)

Compare capacity with [AA batteries] [Powerpack] [Phone]

Battery typeWatt-hourempty after
Iphone 5 - 1440mAh @ 3.8V:5.47 Wh13.1 minutes
Iphone 5s - 1570mAh @ 3.8V:5.97 Wh14.3 minutes
Iphone 6/7 - 1880mAh @ 3.8V:7.14 Wh17.1 minutes
Iphone 6s/7s - 2915mAh @ 3.8V:11.08 Wh26.6 minutes
Samsung Galaxy S8 - 3500mAh @ 3.85V:13.48 Wh32.3 minutes

References