physics help this guys chapter electricity
Answers
(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.
(b) generally the resistivity of alloys is more than the metals, that's why alloys are used.
(c) In series circuits voltage is divided. Each component of a series circuit receives a small voltage so the amount of current decreases and the device becomes hot and does not work properly. Hence, series arrangement is not used in domestic circuits.
(d) Resistance (R) of a wire is inversely proportional to its area of cross-section (A), i.e. when area of cross section increases the resistance decreases or vice versa. (e) Copper and aluminium are good conductors of electricity also they have low resistivity. So they are usually used for electricity transmission.