how to calculate electric watts, Every electrical device, regardless of its type, has a maximum capacity. This capacity is measured in watts and in volts amperes. What concerns us in this article is how to calculate watts for household electrical appliances, Because it is an important topic, everyone is required to familiarize themselves with the law used for each type of stream in the calculation process.

Electric wattage calculation laws

Watt is the unit of measurement for the actual electrical power of an electrical device. It can be found using a simple arithmetic operation given the current (in amperes) and potential difference (in volts). Since the voltage supplying the house is of an alternating type, and its value is 220 volts or 110 volts, Alternating current is represented by the symbol AC.

While DC loads, You do not need to know the power factor, because in all cases, the parameter 1 is true. DC is denoted by the symbol DC.

Watts (1 phase) = volts x amperes x power factor

Watts (3 phases) = 1.73 x volts x amperes x power factor

Watts (DC) = Volts x Amps

Whereas, the power factor (PF) ranges from 0 to 1.

Steps for calculating the electric wattage of alternating current

Among the steps that must be followed in order to find the capacity of the device in watts:

• O no: Determining the value of the voltage of the source supplying the electrical device.
• Secondly: Determine the current (amperes) of the electrical device.
• Third: If the device is powered by 1 phase, Use the following arithmetic relationship: Watts = volts x amperes x power factor.
• Fourthly: If the device works with a 3-phase source, Use the following arithmetic relationship: Watts = 1.73 x volts x amperes x power factor.

Steps for calculating electric watts for DC current

• O no: Determine the voltage value (in volts).
• Secondly: Determine the value of the current (in amperes).
• Third: Use the following calculation: Watts (DC) = Volts x Amps

Examples of calculating electrical watts

Example 1:

An electric appliance that operates on an alternating voltage of 220VAC (1 phase), Its current is 10 amps. and power factor 1, Calculate the power of the device in watts?

Watts (1 phase) = volts x amperes x power factor

= 220 x 10 x 1 = 2200 watts

Example 2:

Electric load (3 phases) working on a voltage of 380VAC, Its current is 5 amps. and its power factor is 0.8, Calculate the carrying capacity in watts?

Watts (3 phase) = 1.73 x volts x amperes x power factor

= 1.73 x 380 x 5 x 0.8 = 2629.6 Watts

Example 3:

LED works on 12VDC battery, The current drawn from the LED is 1 ampere. Calculate the power of the LED in watts?

Watts (DC) = Volts x Amps

= 12 x 1 = 12 watts

important note: For 3-phase motors, a new factor is added to the calculation, which is the efficiency of the electric motor.

In conclusion, there are programs or applications that allow you to calculate the electrical wattage in a nutshell without the need to use arithmetic operations.

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