State the factors on which the heat produced in a current carrying conductor depends. Give one practical application of this effect.
$(i)$ Heat produced in a current carrying conductor depends upon
$(a)$ Square of the current $\left( I ^{2}\right)$
$(b)$ Resistance of the given conductor $(R).$
$(c)$ Time for which the current flows $(t)$
$(ii)$ This effect is applicable in electric heating device like electric iron.
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.
Silicon is $......$
Two electric bulbs $A$ and $B$ are marked $220\, V, 60 \,W$ and $220\, V , 100\, W$ respectively. Which one of the two has greater resistance ?
State the formula co$-$relating the electric current flowing in a conductor and the voltage applied across it. Also, show this relationship by drawing a graph. What would be the resistance of a conductor, if the current flowing through it is $0.35$ ampere when the potential difference across it is $1.4$ volt ?
Of which physical quantity is the $joule/coulomb$ a unit?