Question

Give reason, why

(i) Connecting wires are made of copper.

(ii) Nichrome is used to make the element of electric heater and

(iii) The 500 W bulb glows with more brightness than a 200 W bulb?​

Answer 1

Answer:

1. Copper electrical wires are safer to use than wires made of most other conductive metals because they are resistant to heat. As you can see, copper is the preferred metal for electrical wires for several reasons. It has high electrical conductive; it's inexpensive; it's ductile; and it's thermal resistant.
2. Because of its low cost of manufacture, strength, ductility, resistance to oxidation, stability at high temperatures, and resistance to the flow of electrons, nichrome is widely used in electric heating elements in applications such as hair dryers and heat guns.
3. Now,the input in the first stage (electrical energy) is the result behind the product of the second stage (light energy). Now, greater the amount of the input is given in the first stage will produce greater the amount of the product in the second stage. That's why 500W bulb glows brighter than 200W bulb.