JEE Mains · Physics · STD 12 - 3. current electricity
An electrical bulb rated \(220\,V , 100\,W\), is connected in series with another bulb rated \(220\,V\), \(60\,W\).If the voltage across combination is \(220\,V\), the power consumed by the \(100\,W\) bulb will be about \(........... W\)
- A \(14\)
- B \(13\)
- C \(12\)
- D \(11\)
Answer & Solution
Correct Answer
(A) \(14\)
Step-by-step Solution
Detailed explanation
\(R _{1}=\frac{ V ^{2}}{ P }=\frac{220^{2}}{100}=484\) \(R _{2}=\frac{ V ^{2}}{ P }=\frac{220^{2}}{60}=484\left(\frac{10}{6}\right)\) \(I =\frac{220}{484+484 \times \frac{10}{6}}\) \(P _{1}= I ^{2} R _{1}=14.06\,W\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- In a hydrogen like atom electron make transition from an energy level with quantum number \(n\) to another with quantum number \((n- 1)\). If \(n > > 1\), the frequency ofradiation emitted is proportional toJEE Mains 2013 Medium
- Binding energy of a certain nucleus is \(18 \times 10^8 J\). How much is the difference between total mass of all the nucleons and nuclear mass of the given nucleus?JEE Mains 2024 Medium
- The kinetic energy of emitted electron is \(E\) when the light incident on the metal has wavelength \(\lambda\). To double the kinetic energy, the incident light must have wavelength.JEE Mains 2022 Medium
- A wire of resistance \(20 \Omega\) is divided into \(10\) equal parts. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is _______\(\Omega\).JEE Mains 2024 Hard
- A block of mass \(m =1\, kg\) slides with velocity \(v=6\, m / s\) on a frictionless horizontal surface and collides with a uniform vertical rod and sticks to it as shown. The rod is pivoted about \(O\) and swings as a result of the collision making angle \(\theta\) before momentarily coming to rest. If the rod has mass \(M =2 \,kg \) and length \(l=1\, m\) the value of \(\theta\) is approximately (Take \(\left.g=10 \,m / s ^{2}\right)\)
JEE Mains 2020 Hard - A plane electromagnetic wave of frequency \(100\, MHz\) is travelling in vacuum along the \(x -\) direction. At a particular point in space and time, \(\overrightarrow{ B }=2.0 \times 10^{-8} \hat{ k } T\). (where, \(\hat{ k }\) is unit vector along \(z-\)direction) What is \(\overrightarrow{ E }\) at this point ?JEE Mains 2021 Medium
More PYQs from JEE Mains
- Let the mean and variance of the frequency distribution
be \(6\) and \(6.8\) respectively. If \(x_{3}\) is changed from \(8\) to \(7 ,\) then the mean for the new data will be:\(\mathrm{x}\) \(\mathrm{x}_{1}=2\) \(\mathrm{x}_{2}=6\) \(\mathrm{x}_{3}=8\) \(\mathrm{x}_{4}=9\) \(\mathrm{f}\) \(4\) \(4\) \(\alpha\) \(\beta\) JEE Mains 2021 Easy - A circular disc \(D_1\) of mass \(M\) and radius \(R\) has two identical discs \(D_2\) and \(D_3\) of the same mass \(M\) and radius \(R\) attached rigidly as its opposite ends (see figure). The moment of inertia of the system about the axis \(OO\)’, passing through the centre of \(D_1\) as shown in the figure, will
JEE Mains 2019 Hard - What will be the projection of vector \(A=\hat{i}+\hat{j}+\hat{k}\) on vector \(\vec{B}=\hat{i}+\hat{j}\).JEE Mains 2021 Medium
- For \(a\) gas \(C_{p}-C_{V}=R\) in a state \(P\) and \(C_{p}-C_{V}=1.10 R\) in a state \(Q, T_{p}\) and \(T_{Q}\) are the temperatures in two different states \(P\) and \(Q\) respectively. ThenJEE Mains 2021 Medium
- The centre of a wheel rolling on a plane surface moves with a speed \(v_{0} .\) A particle on the rim of the wheel at the same level as the centre will be moving at a speed \(\sqrt{x}\, v_{0}\). Then the value of \(x\) is ...... .JEE Mains 2021 Medium
- A ray of light through \((2,1)\) is reflected at a point \(P\) on the \(y\) - axis and then passes through the point \((5,3)\). If this reflected ray is the directrix of an ellipse with eccentrieity \(\frac{1}{3}\) and the distance of the nearer focus from this directrix is \(\frac{8}{\sqrt{53}}\), then the equation of the other directrix can be :JEE Mains 2021 Hard