Physics Tuition Singapore Secondary Science Tuition – Electricity Chemical Effect

Chemical effect

• A chemical change caused by electricity is called electrolysis
• An electrolyte is a liquid or a solution which can conduct electricity. The electrolyte undergoes chemical change when electricity passes through it.
• Electrodes are electrical contacts which allows electric current to leave and to enter the electrolyte.
• Electrolysis is widely used in electroplating and in the extraction of metals.

Electroplating

• In electroplating, an object is coated with a layer of metal.
• The object to be coated is connected to the negative terminal of the power supply.
• The metal to coat an object is connected to the positive terminal of the power supply.

The purpose for electroplating an object:

– For shiny attractive appearance
– To prevent object made of iron and steel from rusting

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