$Ohm's$ law is a relation between the power used in a circuit to the current and the potential difference.

What is meant by "electrical resistance" of a conductor? State how the resistance of a conductor is affected when $(i)$ a low current passes through it for a short duration; $(ii)$ a heavy current passes through it for about $30$ seconds.

Define electrostatic potential at a point.

What is a voltmeter? How is it connected in a circuit?

$1 \; kWh = \ldots \ldots \; \text{joules}$

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 a 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?