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Hi, the formula used to calculate this is P = U x I.

where:

P = Watt (W)

U = voltage (V)

I = current (A)

You need 2 units to calculate the third one.

Volt x current equals Watt

240 V x 0.1 A (equals 100mA) = 24 Watt

Answer

The equation for (true) power in an AC circuit is: P = (U I) x power factor

So, you need to know the power factor of the load in order to calculate the power. With the information you supply, you can only calculate the apparent power, expressed in volt amperes, which is the product of the supply voltage and the load current -using the figures that you supply, this will be 24 V.A.

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Q: 240 volts ac 100 ma is equal to how many watts?
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