Electrical Power calculator

Calculate power (Watt)

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

Calculate energy (KWh/Joule)

After 1 hours of continuous power usage:

Charge (Ah)1 Ah
Energy (kWh)5 Wh
Energy (Joule)18 MJ
Energy (Calorie)4.3 Mcal

Calculate capacity (mAh/Wh)

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

Battery typeWatt-hourempty after
Iphone 5 - 1440mAh @ 3.8V:5.472 Wh1.1 hours
Iphone 5s - 1570mAh @ 3.8V:5.966 Wh1.2 hours
Iphone 6/7 - 1880mAh @ 3.8V:7.144 Wh1.4 hours
Iphone 6s/7s - 2915mAh @ 3.8V:11.077 Wh2.2 hours
Samsung Galaxy S8 - 3500mAh @ 3.85V:13.475 Wh2.7 hours