The formula for an electric current is $.....$

How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?

Find out the following in the electric circuit given in the figure:
$(a)$ Effective resistance of two $8\, \Omega$ resistors in the combination.
$(b)$ Current flowing through $4\, \Omega$ resistor.
$(c)$ Potential difference across $4\, \Omega$ resistor.
$(d)$ Power dissipated in $4\, \Omega$ resistor.
$(e)$ Difference in ammeter readings,if any.

The filament of an electric bulb is made of tungsten. Why?

List any two factors on which the resistance of a conductor depends.

Five bulbs are connected in a series circuit. If the third bulb in the middle blows out,what happens?