JEE Main Current Electricity Practice Questions With Solutions

The effective resistance between $A$A and $B$B, if resistance of each resistor is $R$R, will be :

A galvanometer has a coil of resistance $200\mathrm{\Omega }$200 \Omega with a full scale deflection at $20\mu \mathrm{A}$20 \mu A. The value of resistance to be added to use it as an ammeter of range $(0-20)\mathrm{mA}$\left(\right. 0 - 20 \left.\right) mA is :

The equivalent resistance between A and B is :

Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be _________ to __________ times of its initial length if the water is to be boiled in 15 minutes.

In the given circuit, the terminal potential difference of the cell is :

The number of electrons flowing per second in the filament of a $110\mathrm{W}$110 \textrm{ } W bulb operating at $220\mathrm{V}$220 \textrm{ } V is : (Given $\mathrm{e}=1.6\times {10}^{-19}\mathrm{C}$e = 1.6 \times 10^{- 19} C)

The value of unknown resistance $(x)$\left(\right. x \left.\right) for which the potential difference between $B$B and $D$D will be zero in the arrangement shown, is :

The ratio of heat dissipated per second through the resistance $5\mathrm{\Omega }$5 \Omega and $10\mathrm{\Omega }$10 \Omega in the circuit given below is:

A galvanometer of resistance $100\mathrm{\Omega }$100 \Omega when connected in series with $400\mathrm{\Omega }$400 \Omega measures a voltage of upto $10\mathrm{V}$10 \textrm{ } V. The value of resistance required to convert the galvanometer into ammeter to read upto $10\mathrm{A}$10 \textrm{ } A is $x\times {10}^{-2}\mathrm{\Omega }$x \times 10^{- 2} \Omega. The value of $x$x is :

In the given figure ${\mathrm{R}}_1=10\mathrm{\Omega },{\mathrm{R}}_2=8\mathrm{\Omega },{\mathrm{R}}_3=4\mathrm{\Omega }$R_{1} = 10 \Omega , R_{2} = 8 \Omega , R_{3} = 4 \Omega and ${\mathrm{R}}_4=8\mathrm{\Omega }$R_{4} = 8 \Omega. Battery is ideal with emf $12\mathrm{V}$12 \textrm{ } V. Equivalent resistant of the circuit and current supplied by battery are respectively :