In an experimental set$-$up as shown below, a piece of silver was placed touching points $A$ and $B .$ Next time it was replaced by a piece of wood. In which case did the bulb glow ? Give reason to justify the observation.
The bulb will glow in case of silver piece because it is a good conductor of electricity. Wood is a bad conductor of electricity, therefore, when it will be placed the bulb will not glow.
Why is much less heat generated in long electric cables than in filaments of electric bulbs ?
Define current. Give its $SI$ unit.
An electric iron draws a current of $0.5\, A$ when the voltage is $200$ volt. Calculate the amount of electric charge flowing through it in one hour.
The resistance of one conducting wire is $10\, \Omega$. If battery of $1.5\, V$ is connected to it, then how much electric current will flow through it?
How does use of a fuse wire protect electrical appliances?