The electric current flowing through any conductor is directly proportional to the electric potential difference across the conductor. Which law is this?

What is the resistance of an ideal voltmeter?

$(i)$ Draw a circuit diagram to show how two resistors are connected in series.
$(ii)$ In a circuit,if two resistors of $5 \ \Omega$ and $10 \ \Omega$ are connected in series,how does the current passing through the two resistors compare?

What is the commercial unit of electrical energy? Represent it in terms of joules.

Define electric power. Give its $SI$ units and write its mathematical equation.

What are the factors on which the resistance of a conductor depends?