Question

20. The power-voltage rarting of an electric device is 100 W-250V what does it mean? ​

Answer 1

Explanation:

The power rating of electrical appliance tells us the rate at which electrical energy is consumed. A power rating of an appliance is 100w - 250v means the appliance has a power consumption of 100 watts and 250 volts means that it should be used on voltage of 250v.

Answer 2

Power - Voltage of an electrical device is 100 Watt-250 Volts.

This means :

• Whenever the electrical device is connected to a circuit having a potential difference of 250 volts then the power output of the electrical device will be 100 watts.

Also, the safety margin of the electrical device is 250 volts above which it might not operate properly.

Mathematically, we can also calculate the resistance of the electrical device as follows:

$resistance = \dfrac{ {V}^{2} }{W}$

$\implies resistance = \dfrac{250 \times 250}{100}$

$\implies resistance = 625 \: ohm$

• So, the distance of the electrical device is 625 ohm.