Two electric bulbs, rated at (25 W, 220 V) and (100 W, 220 V), are connected in series across a 220 V voltage source. If the 25 W and 100 W bulbs draw powers P1 and P2 respectively, then:

Question:

Twoelectric bulbs, rated at $(25 \mathrm{~W}, 220 \mathrm{~V})$ and $(100 \mathrm{~W}, 220 \mathrm{~V})$, are connected in series across a $220 \mathrm{~V}$ voltage source. If the $25 \mathrm{~W}$ and $100 \mathrm{~W}$ bulbs draw powers $\mathrm{P}_{1}$ and $\mathrm{P}_{2}$ respectively, then:

  1. $P_{1}=16 \mathrm{~W}, P_{2}=4 \mathrm{~W}$

  2. $\mathrm{P}_{1}=16 \mathrm{~W}, \mathrm{P}_{2}=9 \mathrm{~W}$

  3. $\mathrm{P}_{1}=9 \mathrm{~W}, \mathrm{P}_{2}=16 \mathrm{~W}$

  4. $P_{1}=4 W, P_{2}=16 W$


Correct Option: 1

Solution:

Related Questions

  • A circuit to verify Ohm’s law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the circuit:

    View Solution

  • Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity $\rho_{C}, \rho_{T}, \rho_{M}$ and $\rho_{A}$ respectively. Then :

    View Solution

  • To verify Ohm’s law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained :

    If $\mathrm{V}_{\mathrm{o}}$ is almost zero, identify the correct statement:

    View Solution

  • A current of $5 \mathrm{~A}$ passes through a copper conductor (resistivity) $=1.7 \times 10^{-8} \Omega \mathrm{m}$ ) of radius of cross-section $5 \mathrm{~mm}$. Find the mobility of the charges if their drift velocity is $1.1 \times 10^{-3} \mathrm{~m} / \mathrm{s}$.

    View Solution

  • In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

    One may canclude that:

    View Solution

  • Space between two concentric conducting spheres of radii $a$ and $b(b>a)$ is filled with a medium of resistivity $\rho$. The resistance between the two spheres will be :

    View Solution

  • In a conductor, if the number of conduction electrons per unit volume is $8.5 \times 10^{28} \mathrm{~m}^{-3}$ and mean free time is $25 f s$ (femto second), it’s approximate resistivity is $\left(\mathrm{m}_{0}=9.1 \times 10^{-31} \mathrm{~kg}\right)$

    View Solution

  • A $200 \Omega$ resistor has a certain color code. If one replaces the red color by green in the code, the new resistance will be :

    View Solution

  • The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure:

    What is the value of current at $\mathrm{t}=4 \mathrm{~s}$ ?

    View Solution

  • A resistance is shown in the figure. Its value and tolerance are given respectively by:

    View Solution

Leave a Reply

Your email address will not be published.

error: Content is protected !!
Download App