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 ?	2.08 A (Ampere)	A = C/s
Resistance ?	5.76 Ω (Ohm)	Ω = V / A
Active power ?	25 W (Watt)	rate of energy transfer / W = V * A

Calculate energy (KWh/Joule)

After 4 days of continuous power usage:

Charge (Ah)	200 Ah
Energy (kWh)	2.4 KWh
Energy (Joule)	8.64 GJ
Energy (Calorie)	2.06 Gcal

Calculate capacity (mAh/Wh)

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

Battery type	Watt-hour	empty after
Rechargeable AA Li-ion - 800mAh @ 3.6V:	2.88 Wh	6.9 minutes
Non-rechargeable AA Zinc-Carbon - 900mAh @ 1.5V:	1.35 Wh	3.2 minutes
Rechargeable AA NiCd - 1000mAh @ 1.2V:	1.2 Wh	2.9 minutes
Non-rechargeable AA Zinc-Chloride - 1500mAh @ 1.5V:	2.25 Wh	5.4 minutes
Rechargeable AA NiZn - 1800mAh @ 1.6V:	2.88 Wh	6.9 minutes
Rechargeable AA NiMH - 2850mAh @ 1.2V:	3.42 Wh	8.2 minutes
Non-rechargeable AA Alkaline - 3000mAh @ 1.5V:	4.5 Wh	10.8 minutes

References

AC Power

Difference Between Watts And Volt-Amperes