A wire connected to a bulb does not glow, whereas the filament of the bulb glows when the same current is passed through them. Why ?
$(a)$ Name the effect of electric current which is utilised in the working of an electrical fuse.
$(b)$ How is a fuse connected in a domestic circuit ?
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2\,\Omega $ in series with a combination of two resistors ($4\,\Omega $ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2\,\Omega $ resistor be the same as that across the parallel combination of $4\,\Omega $ resistors? Give reason.
What makes the electric current to flow through an electrolyte?
An electric heater rated $1200\, W$ operates $2$ hour per day. Find the cost of the energy required to operate it for $30$ days at ₹ $5.00$ per unit.