A half of an amp equals 500 mA.
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ma or mA means milliAmp or milliAmpere. As milliAmpere and Ampere are related as: 1mA = 1*10^-3 A = 0.001 A, so you can express 500 ma as 500*0.001 A = 0.5 A. See relarted linksbelow.
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You can't convert units of power to units of current - those are different things. They are related as follows:
Watts = volts x amperes
This is assuming DC; in AC there are some additional complication:
Watts = volts x amperes x power factor
However, the power factor is often close to 1.
To convert milliamps (mA) to watts (W), you need to know the voltage. If the voltage is 1 volt, then 500mA is equal to 0.5 watts (since Watts = Volts x Amps). If the voltage is different, you would need to multiply the voltage by the amperage in order to calculate the power in watts.
In ideal conditions, about 6W Amps x volts = watts 500ma = 1/2 amp (1000ma to 1a) 0.5 X 12V = 6W
The power of the torch bulb is 1.25 watts calculated as P = V * I, where V is 2.5V and I is 500mA converted to 0.5A.
5.1v is the Voltage, You need to also look at what the Amperage rating is on the charger. 500ma, 1000ma, etc. How many Milliamps?
100 watt
There are 1,000 watts in a kilowatt (kW).