a) Rajesh is making a circuit and using nichrome wires for conducting current. His friend Gaurav stopped him from doing this. Explain why?
b) Which wire should be used and why?
c) Why is tungsten used in making filaments of bulbs?
b) Which wire should be used and why?
c) Why is tungsten used in making filaments of bulbs?
Answers & Comments
a) Gaurav stopped Rajesh from using nichrome wires for conducting current because nichrome has a relatively high resistance, which can lead to excessive heating when current flows through it. This can be dangerous and even cause the wire to melt or start a fire.
b) Typically, copper wire is preferred for conducting current in most electrical circuits. Copper has low electrical resistance, which means it doesn't generate much heat when carrying current, making it safer and more efficient for this purpose.
c) Tungsten is used in making filaments for bulbs because it has a very high melting point, around 3,422 degrees Celsius (6,192 degrees Fahrenheit). This property allows the filament to become white-hot and emit visible light without melting or vaporizing, making it ideal for incandescent light bulbs.