Electrical Power calculator

Volt picoV nanoV microV milliV V kiloV megaV gigaV

Ampere picoamp nanoamp microamp milliamp A

Duration seconds minutes hours days weeks months years

Calculate!

Calculate power (Watt)

Potential ?	12 V (Volt)
Current ?	0.42 A (Ampere)	A = C/s
Resistance ?	28.78 Ω (Ohm)	Ω = V / A
Active power ?	5 W (Watt)	rate of energy transfer / W = V * A

Calculate energy (KWh/Joule)

After 2.857 weeks of continuous power usage:

Charge (Ah)	200.16 Ah
Energy (kWh)	2.4 KWh
Energy (Joule)	8.65 GJ
Energy (Calorie)	2.07 Gcal

Calculate capacity (mAh/Wh)

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

Battery type	Watt-hour	empty after
Iphone 5 - 1440mAh @ 3.8V:	5.47 Wh	1.1 hours
Iphone 5s - 1570mAh @ 3.8V:	5.97 Wh	1.2 hours
Iphone 6/7 - 1880mAh @ 3.8V:	7.14 Wh	1.4 hours
Iphone 6s/7s - 2915mAh @ 3.8V:	11.08 Wh	2.2 hours
Samsung Galaxy S8 - 3500mAh @ 3.85V:	13.48 Wh	2.7 hours

References

AC Power

Difference Between Watts And Volt-Amperes