What is the main principle involved in Voltaic cell?
Conversion of chemical energy into heat energy.
Conversion of heat energy into electrical energy.
Conversion of chemical energy into electrical energy.
Conversion of electrical energy into chemical energy.
In an electrical circuit three incandescent bulbs $A, B$ and $C$ of rating $40\, W, 60\, W$ and $100 \,W $ respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
$(a)$ State the commercial unit of electric energy and find its relation with its $SI$ unit.
$(b)$ The current through a resistor is made three times its initial value. Calculate how it will affect the heat produced in the resistor.
$(c)$ Find the increase in the amount of heat generated in a conductor if another conductor of double resistance is connected in the circuit keeping.all other factors unchanged.
If a wire of resistance $R$ is melted and recast to half of its length, then new resistance of the wire will be
Why is parallel arrangement used in domestic wiring?
When two resistors of resistances $R_{1}$ and $R_{2}$ are connected in parallel, the net resistance is $3\, \Omega$. When connected in series, its value is $16\, \Omega$. Calculate the values of $R_{1}$ and $R_{2}$