To calculate the watts of a 12V DC portable vacuum cleaner, you need two pieces of information: the voltage (V) and the current (I) that the vacuum cleaner consumes.
Find the current (I): The current is the amount of electrical charge flowing through the vacuum cleaner's circuit when it's operating. Usually, the current will be specified in amperes (A) on the vacuum cleaner's label or in the user manual.
Apply Ohm's Law: Ohm's Law states that power (P) is equal to the voltage (V) multiplied by the current (I). In mathematical terms: P = V * I.
Calculate the watts (P): Now that you have the voltage (V) and the current (I), simply multiply them to get the power in watts (W).
For example, if the portable vacuum cleaner operates at 12V DC and has a current consumption of 5 amperes (5A), the calculation would be:
P = 12V * 5A = 60 watts
Therefore, the portable vacuum cleaner would consume approximately 60 watts of power when operating.