Question

how wastage of electricity can be reduced ​

Answer 1

1) switch off electrical devices when not in use.
2) use devices with low power consumption
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Answer 2

Answer:

There are many ways you can reduce electricity use in your home: Properly insulate and air seal your home. Select an energy-efficient heating system that doesn't use electricity. Electric water heating -- Purchase an energy-efficient electric water heater and operate it efficiently.