The number of dry cells, each of $e.m.f.$ $1.5\,volt$ and internal resistance $0.5\, ohm$ that must be joined in series with a resistance of $20\, ohm$ so as to send a current of $0.6\,A$ through the circuit is
Medium
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1By what percentage will the illumination of the lamp decrease if the current drops by $20 \%$ ?View Solution
- 2There are two electric bulbs of $40\, W$ and $100\, W$. Which one will be brighter when first connected in series and then in parallel,View Solution
- 3The figure shows a network of five resistances and two batteries The total electrical power consumed by the circuit is ............... $W$View Solution
- 4The charge accumulated on the capacitor connected in the following circuit is________ $\mu \mathrm{C}$ (Given $\mathrm{C}=150\ \mu \mathrm{F}$ )View Solution
- 5The number density of free electrons in copper is nearly $8 \times 10^{28}\,m ^{-3} . A$ copper wire has its area of cross section $=2 \times 10^{-6}\,m ^2$ and is carrying a current of $3.2\,A$. The drift speed of the electrons is $.....\times 10^{-6}\,ms ^{-1}$.View Solution
- 6View SolutionThe three resistance of equal value are arranged in the different combinations shown below. Arrange them in increasing order of power dissipation.
- 7The resistance of a conductor is $5\, ohm$ at $50\,^oC$ and $6\, ohm$ at $100\,^oC$. Its resistance at $0\,^oC$ is ................ $ohm$View Solution
- 8If two electric bulbs have $40\, W$ and $60\, W$ rating at $220\, V$, then the ratio of their resistances will beView Solution
- 9A student has $10$ resistors of resistance ‘$r$’. The minimum resistance made by him from given resistors isView Solution
- 10$n$ identical cells each of $e.m.f.$ $E$ and internal resistance $r$ are connected in series. An external resistance $R$ is connected in series to this combination. The current through $R$ isView Solution