What is the symbol used to denote the unit of resistance,ohm?

In the following circuits (Figure),heat produced in the resistor or combination of resistors connected to a $12\, V$ battery will be

Of which physical quantity is the $joule/coulomb$ a unit?

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

When a high resistance voltmeter is connected directly across an electric bulb,its reading is $2 \ V$. An electric cell is sending a current of $0.4 \ A$ (measured by an ammeter) in the electric circuit.
$(a)$ Draw the circuit.
$(b)$ Find the resistance of the electric bulb.
$(c)$ State the law that is applied for making these calculations. If a graph is plotted between $V$ and $I$,show the nature of the graph obtained.

How much work is to be done in moving a charge of $2 \, C$ through an electric potential difference of $6 \, V$ (in $, J$)?