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

How does use of a fuse wire protect electrical appliances?

Given reason for the following

$(i)$ Tungsten used almost exclusively for filament of electric lamp.

$(ii)$ Why do we use copper and aluminium wires for transmission of electric current ?

Read the following statements carefully and write whether the statement is true or false

$(i)$ The quantity of charge flowing past a point multiplied by time is current.

$(ii)$ The flow of charge through a conducting wire connected to a cell is the result of chemical reaction inside the cell

$(iii)$ The resistivity of all pure metals increases with increase in temperature.

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

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

$(vi)$ A conducting wire offers resistance to the flow of electrons because electrons repel each other in the wire.

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

If five equal pieces of wire having $5\, \Omega$ resistance are made and connected in parallel, then their equivalent resistance will be $......$