Explain the following.
A. Why is the tungsten used almost exclusively for filament of electric lamps?
B. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
C. Why is the series arrangement not used for domestic circuits?
D. How does the resistance of a wire vary with its area of cross-section? (e) Why are copper and aluminium wires usually employed for electricity transmission?
Answer:A
Explain the following.
A. Why is the tungsten used almost exclusively for filament of electric lamps? B. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal? C. Why is the series arrangement not used for domestic circuits? D. How does the resistance of a wire vary with its area of cross-section? (e) Why are copper and aluminium wires usually employed for electricity transmission?