Question

a) Why is Tungsten used almost exclusively for the filament of electric lamps? b) How does the use of a fuse wire protect electrical appliances?

Answer 1

Answer:

a) Pure tungsten has some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals. Because of these properties, it is the most commonly used material for light bulb filaments.

Tungsten is used in filament of electric bulb and lamps because tungsten is a metal which has high melting point 3,422 °C and we know that electricity causes heating , therefore due to high temperature the tungsten does not melt

b) An electrical fuse works by breaking the circuit when there is a fault in an appliance that causes too much current to flow. The wire within the circuit melts due to the heat generated when the current going through the circuit is too great. The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

Answer 2

Explanation:

a) Because it is a very good conductor of electricity and it has a very high melting point.

b) It helps as when high current flows through the circuit which can harm the appliance it shuts down the current supply.