Hi All,
Good Morning.I have an extension box which has five plug points. I suspect all five points supply same amount of electricity despite the devices only need a fraction of it. Am I right? For instance, my home is being supplied 240 volts but my mobile charger consumes the full 240 just to supply only 12 or 25 volts to my mobile. I am thinking what if I make an extension box having dedicated plugs having designated plug points with different desired voltage levels. Is it worth making it? My primary doubt is, a charger with 240 Volts input spec will work on 30 volts still supplying the same 20 or 30 volts needed by mobile. Please answer. My last month electricity bill is 7500 INR.

 

.I have an extension box which has five plug points.

In my country an extension box might look like this. In this case there are three plug points. This cord pulls zero current when there is no load. It does not use 3 or 5 time more power. It is rated for 13 amps which could be 13+0+0 amps or 3+5+5 for example.

my mobile charger consumes the full 240 just to supply only 12 or 25 volts to my mobile.

To make the math easy, the house is 240V and the mobile is 24 volts so the ratio is 10:1. If the mobile home is using 24V at 10 amps that is 240 watts of energy. From the house we have 240V at 1A = 240 watts. That is 240 watts from the house and 240 watts to the mobile home. There is not really a problem here.

I hope you are sending 240 volts over the long wire to the mobile home. I hope you do not send the 12 or 25 volts over the long wire. That is not efficient.
I hope this helps. Ask more questions if you want.
RonS.

 

I suspect all five points supply same amount of electricity despite the devices only need a fraction of it.

No.
They supply the same voltage, not the same power, which is what you pay for, and that is determined by each device that is connected.
Devices are designed to run from a specific voltage (in your case 240V) and will not work properly if it is below their voltage rating.
You appear to have the incorrect idea that devices waste power by operating from a high voltage but they typically efficiently convert it to the internal voltage they need. only taking the current they need for the power the device consumes (power equals voltage time current).
Thus a device designed for 240V will take 1/2 the current of one designed for 120V, if it does the same function with the same amount of power.

So your you devices won't work with the different voltage levels you want to generate and you wouldn't save any power.
The only ways to reduce you electricity bill is to use fewer devices or more efficient devices, or get solar panels.

What devices do you have that take all the power you use?

 

5 mobile chargers and 4 BBW wallflowers. A laptop charger. An airconditioner. An old
ceiling fan. A water pumping motor. Kettle. An Alexa enabled smart speaker. A tube light and a night lamp.

 

5 mobile chargers and 4 BBW wallflowers. A laptop charger. An airconditioner. An old
ceiling fan. A water pumping motor. Kettle. An Alexa enabled smart speaker. A tube light and a night lamp.

Of those listed, only the air conditioner and water pumping motor likely use significant power.
What is the purpose of the water pump?

 

Of those listed, only the air conditioner and water pumping motor likely use significant power.
What is the purpose of the water pump?

Tank located above 15 feet from the ground level.

 

Tank located above 15 feet from the ground level.

So how much does it run?
Is it for your household water supply?

 

We run it an hour daily. Yes. It's for household only.

 

We run it an hour daily. Yes. It's for household only.

So it would likely roughly take its HP power rating divided by 746 in kWh daily.

 

My primary doubt is, a charger with 240 Volts input spec will work on 30 volts still supplying the same 20 or 30 volts needed by mobile.

No, It will probably work down to 100V AC, no lower. It will probably work more efficiently on 240V than it does on a lower voltage.
If you convert your 240V AC to a lower voltage to supply the charger, you will incur two lots of conversion losses, so overall, it will cost you more.
Just make sure you disconnect the charger from the mains when it is not being used. That will save you a tenth of a kWh a week!

 

5 mobile chargers and 4 BBW wallflowers. A laptop charger. An air conditioner. An old
ceiling fan. A water pumping motor. Kettle. An Alexa enabled smart speaker. A tube light and a night lamp.

Your problem seems to be your Electricity bill.
How efficient is your Air Conditioner? How many hours a day do you use it? Use it less and your costs will come down.

... I suspect all five points supply same amount of electricity despite the devices only need a fraction of it. Am I right? For instance, my home is being supplied 240 volts but my mobile charger consumes the full 240 just to supply only 12 or 25 volts to my mobile. I am thinking what if I make an extension box having dedicated plugs having designated plug points with different desired voltage levels. Is it worth making it? ...

No.

 

The kettle, if it is like the ones in the UK, consumes several hundred watts when it is heating. The air conditioner is also a large power consumption device.
None of the devices "consume electricity", they consume POWER, (WATTS), not the voltage. so the charger that delivers 5 volts at one amp consumes a bit more that 5 watts. The different devices only consume the POWER that they require, so unless they are also getting hot, they are not consuming more power than they are delivering. The kettle may consume 500 watts while it is heating, the air conditioner may consume 800 watts while it is cooling. So the concept of a "BOX" to supply less power is not correct.
The incorrect notions are part of the reason why children should learn a bit of science in the early years of school. Even just the principles would be very handy as a way to avoid being confused by those bad actors that cheat people.