The electrical power (p) can be calculated by the measurement of current (i) and voltage (v), according to the basic formula of electric power:
p = vi ]
Where: (p) is the power (in watts, w), (v) is the voltage (in volts, v), and (i) is the current (in amps, a).
To measure the electrical power of a device, you can take the following steps:
Measure Voltage (V): Use a digital or analog voltmeter to measure the voltage of the device by connecting the pen to the power supply of the device. Make sure that the voltage measurement range is appropriate for the voltage level of the device.
Measure current (i): Using an ammeter, connect the ammeter to the power line of the device to measure the current. Again, make sure that the current measurement range is appropriate for the current level of the device.
Calculate power (p): Substitute the measured voltage and current values into the power formula (p = vi) for calculation. Make sure to use the same units, usually the standard units for voltage and current are volts (V) and amps (A), and the standard units for power are watts (W).
For example, if the voltage measurement is 220V and the current measurement is 5A, the power is calculated as:
p = 220v \times 5a = 1100w ]
Therefore, the electrical power of the device is 1100 watts.
Note that accurate measurements of power may need to consider factors such as the electrical power factor, but the above methods are usually accurate enough for general conditions.