Which symbol is used for the resistivity of a conductor?

What is the equivalent resistance between points $A$ and $B$ in the given electrical circuit (in $\Omega$)?

What are the conditions under which $Ohm's$ law is not obeyed?

An electric iron consumes energy at a rate of $840\, W$ when heating is at the maximum rate and $360\, W$ when the heating is at the minimum. The voltage is $220\, V$. What are the current and the resistance in each case?

If resistors are connected in parallel,the voltage across each remains the same.

$A$ series circuit has only one conducting path for the electrons that move through it; a parallel circuit has multiple conducting paths.