You are using your smartphone all the time. From communicating with someone, shopping and paying bills, to buying bus and train tickets, to watching movies, everything is possible with a smartphone. So it can be said that having a smartphone with you is a must. However, charging your smartphone is very important to keep it alive.
How many times do you charge your smartphone a day? Once or twice. Sometimes you have to charge your smartphone for the third time in a day. But do you know how much electricity is consumed by charging your smartphone once a day?
How much electricity it takes to charge a smartphone per day, and how much it costs, depends on a few factors. These factors are:
Smartphone battery capacity: Smartphone batteries typically range from 3,000 mAh to 5,000 mAh. The power required to charge a 4,000 mAh battery is typically 15-20 watt-hours (watt-hours).
Charger power: Smartphone chargers can usually be 10 watts to 30 watts or more. If there is fast charging technology, the power consumption may be a little higher. In addition, some of the electricity is converted into heat during the charging process. Usually, the power consumption is calculated assuming 85-90 percent efficiency. Usually, mobile phones are charged with a 5-volt charger. Then how much is the power consumption. That is, 150*5 watts per hour. Or 750 watts per hour or 0.75 kilowatts per hour or 0.75 units.
The cost of household electricity in Bangladesh is 7-10 taka per unit (this may vary according to the level of electricity). If the average cost per unit is 7 taka. Then 0.75 units × 7 taka = 5.25 taka. The electricity cost is very low if a smartphone is charged once a day. The monthly cost is between 5-6 taka, which is negligible compared to other daily expenses.
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