is there any appliance in tele shopping network which can cut electricity bill by 30%.can u give me the link?

Answer 1

The biggest guzzler of electricity in a home are:

1. the heater or the air con
2 the washing machine ( if you wash with hot water )
3. the water heater
4. Lights

Optimising the usage on these will reduce electricty.
Experiment a bit. Remember to off the heater when not using

Answer 2

Unfortunately, no.

The only similar thing is a light dimmer, but that isn't going to achieve a remarkable difference in your overall comsumption.