The electrical energy used in our houses is measured in__________.
The electrical energy used in our houses is measured in kilowatt hour.
Fill in the blanks:
(a) The unit in which we pay the cost of electricity is ___
(b) The electrical energy consumed in a house is measured by ___
(c) In a household electrical circuit, the appliances are connected in ___ with the mains.
(d) A switch is connected to the ___ wire.
(e) The red colour insulated wire in a cable is the ___ wire.
(f) One kilowatt hour is equal to ___ joule.
(g) A fuse wire should have low ___.
Answer the following questions.
(a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily?
(b) Why is copper used for electrical wiring in our houses?
(c) Why does a copper vessel shine again after scrubbing?
(d) Give two characteristics of alloys.
(e) What is meant by corrosion?