$A$ metal has a very large number of free electrons and a non-metal has a very small number of free electrons.

Which of the following statements is $NOT$ true for a series combination of two resistors?

Two conducting wires of the same material,equal length,and equal diameter are connected in series. How does the heat produced by the combination of resistance change?

If a $12 \ V$ battery is connected to the arrangement of resistances given below,calculate
$(i)$ the total effective resistance of the arrangement and
$(ii)$ the total current flowing in the circuit.

State reasons for the following:
$(a)$ Tungsten is used for making bulb filaments.
$(b)$ Copper and aluminium are generally used for electricity transmission.
$(c)$ Alloys are commonly used in electrical heating devices such as electric iron and toaster.

List in a tabular form two differences between a voltmeter and an ammeter.