3.Wiring for connecting all the subscribers.

(c) Calculators:

It is a device used for carry out various mathematical calculations. The input required for calculator are as given below.

1.Power source (battery or solar panel).

2.Display device (LED or LCD)

3.Keypad containing all functions and numbers.

4.All electronic circuit devices.

Electronic Waste:

These are the waste electronic devices and if properly utilized may be valuable secondary raw material source for various electronic equipments and if thrown out may act as toxic due to presence of various toxic materials including lead, mercury, cadmium, arsenic etc. uncontrolled burning of these materials may also cause environmental problems.

Electronic waste is sometimes illegally sent to other countries for processing. However, due to complexity and difficulties in recycling, e-waste will remain an issue for the coming days.

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