Question

What is meant by rating of an electrical appliances?

Answer 1

Concept used: Electrical energy

Prerequisite: Knowledge of unit of electrical energy

Electrical energy:

1. The energy that is converted form of the kinetic energy of the moving charges inside the conductor to do the useful work is the electrical energy.
2. The electrical appliances used in homes have written ratings like power, voltage, current, etc. These ratings show the design parameters of the appliance like, power rating shows the power consumed in an hour, and it is usually given in kW-h.
3. Voltage rating shows that the appliance can be used up to the given voltage range above or below the range the appliance may damage; similarly, current ratings are given to ensure the proper functioning of the appliance in the given range of rating.

Examples:

Power rating: 5 kW-h

If an appliance has 5 kW-h of rating, then it means the device will consume 5 kW of energy in 1 hour.

Voltage rating: 210 V-230 V

If an appliance has 210 V-230 V voltage rating, then it means that the appliance can work smoothly in the range of 210 volts to 230 volts.