Calculation of Electrical Energy Units that can be saved
All mobile phone and tablet chargers across the world have a pre-defined star rating. The star rating of a charger is related to the power consumed by the charger itself when connected to a power outlet. A zero star charger consumes the maximum power under no-load, i.e. when the charger is still connected to the supply after the phone has fully charged. A 5-star charger consumes the least power under no-load.
The following table tabulates the amount of electrical energy units wasted in a year for the different types of chargers due to unwanted excess charging.
|Star rating of chargers||No-load consumption(W)||Assumed Excess Charging Time (Hr)||Electrical Units Consumed (KWH)||Electrical Units Consumed in a year||Units consumed in a year by India*|
|a||b||c = a x b/1000||d = c x 365||U = d x 1270 Mn|