Sheetal and Sonia brought an electric iron having a two pin plug. Devender insisted for a three pin plug for the use of electric iron as it provides earthing and thus help us to prevent us from electric shocks if the electric iron goes faulty.
What is earthing?

Soft iron is used in many parts of electrical machines for

An electric iron has a rating 750 W, 220V. It is used for 5 hours daily. Calculate its resistance while glowing?

If an electric iron of 1200 W is used for 30 minutes everyday, find electric energy consumed in the month of April.

What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

What is an electric oscillator ? With the help of labelled diagram, explain the use of junction transistor as.an oscillator.

Why do we use copper and aluminium wire for transmission of electrical current? Why not iron?

Faraday cage: A Faraday cage or Faraday shield lies an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields.Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. Which of the following material can be used to make a Faraday cage?