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

In a household electric circuit different appliances are connected in parallel to one another. Give two reasons for this. An electrician puts a fuse of rating $5 \,A$ in that part of domestic electrical circuit in which an electrical heater of rating $1.5\, kW , 220 \,V$ is operating. What is likely to happen in this case and why ? What change, if any, needs to be made ?

$(a)$ Derive an expression to find the equivalent resistance of three resistors connected in series. Also, draw the schematic diagram of the circuit.

$(b)$ Find the equivalent resistance of the following circuit

What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads $5\, A$. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?

An electron in a metal is free to move anywhere but cannot leave the metal.

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