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 ?	5 V (Volt)
Current ?	7.84 A (Ampere)	A = C/s
Resistance ?	0.64 Ω (Ohm)	Ω = V / A
Active power ?	39.19 W (Watt)	rate of energy transfer / W = V * A

Calculate energy (KWh/Joule)

After 1 hours of continuous power usage:

Charge (Ah)	7.84 Ah
Energy (kWh)	39.19 Wh
Energy (Joule)	141.09 MJ
Energy (Calorie)	33.7 Mcal

Calculate capacity (mAh/Wh)

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

Battery type	Watt-hour	empty after
Small powerpack - 2000mAh @ 5V:	10 Wh	15.3 minutes
Large powerpack - 10000mAh @ 5V:	50 Wh	1.3 hours
Huge powerpack - 15000mAh @ 5V:	75 Wh	1.9 hours
Car Battery lead acid 12V - 50Ah @ 12V:	600 Wh	15.3 hours
Solar Battery lead acid 12V - 200Ah @ 12V:	2400 Wh	2.6 days

References

AC Power

Difference Between Watts And Volt-Amperes