Yup , the transformer which are used to increase or decrease the alternating voltages in electric power appliances .
As we all know without electricity we all return to the Stone age . No bulbs , no fans , no computers , no machines nothing . Everything depends upon the electricity and effective electricity distribution or we can say propagation depends upon the transformer .
We need high voltage for effective power transmission but we can’t use that high voltage to charge our mobile phones ,hence presenting the transformer . It’ll step down that voltage to the value suitable for your phone’s charging .
Depending upon where they are used they can be of two type step up and step down . When we need more output voltage we use step up and vice versa.
So thank you all the brains that were involved in the invention of such beauty.
So, what else would you like to include in this because I guess for that to you need an electricity. Think.