Physics
Which of the cables, one rated 5 A and the other rated 15 A will be of thicker wire? Give a reason for your answer. [Hint :To carry heavy current, the resistance of wire should be low, so its area of cross section should be large].
Related Questions
Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?
Give two characteristics of high tension wire.
The diagram in figure shows three lamps and three switches 1, 2 and 3 connected with two cells.
(a) Name the switch/switches to be closed so as to light all three lamps.
(b) How are then the lamps connected : in series or in parallel.
Describe with the aid of a diagram some form of a fuse, which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.