If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

When a potential difference is applied across, the current passing through

If the potential difference applied across a Collidage tube is increased,

If the potential difference applied across a Coolidge tube is increased , then

When a potential difference is applied across the ends of a linear metallic conductor

When a potential difference (V) is applied across a conductor, the thermal speed of electrons is

Consider the following quantities: number density of free electrons, n, mean free time of electrons between collisions,t , drift velocity of electrons, v_d , resistivity, p. A constant potential difference is applied across a conductor. Assuming that the temperature of the conductor remains constant, which of these quantities is/are independent of the magnitude of the potential difference applied?

A source of constant potential difference is connected across a conductor having irregular cross section as shown.