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
Small powerpack - 2000mAh @ 5V:10 Wh2 hours
Large powerpack - 10000mAh @ 5V:50 Wh10 hours
Huge powerpack - 15000mAh @ 5V:75 Wh15 hours
Car Battery lead acid 12V - 50Ah @ 12V:600 Wh5 days
Solar Battery lead acid 12V - 200Ah @ 12V:2400 Wh2.9 weeks