Question
Two electric bulbs whose resistances are in the ratio 1 : 2 are connected in parallel to a source of constant voltage. What will be the ratio of power dissipation in these wires?
✓
Answer
Power $\text{P}=\frac{\text{V}^2}{\text{R}}\propto\frac{1}{\text{R}}$ For same valtage, the bulbs being in parallel.
$\frac{\text{P}_1}{\text{P}_2}=\frac{\text{R}_2}{\text{R}_1}=\frac{2}{1}.$
Thus, ratio of power dissipated is 2 : 1.
$\frac{\text{P}_1}{\text{P}_2}=\frac{\text{R}_2}{\text{R}_1}=\frac{2}{1}.$
Thus, ratio of power dissipated is 2 : 1.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
According to the classical electromagnetic theory, calculate the initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom.
Each of the batteries shown in figure has an emf equal to 5V. Show that the magnetic field B at the point P is zero for any set of values of the resistances.
The equation $\omega=\frac{\mu_\text{v}-\mu_\text{r}}{\mu-1}$ asderived for a prism having small refracting angle. Is it also valid for a prism of large refracting angle? Is it also valid for a glass slab or a glass sphere?
→Which physical quantities are conserved in natural and artificial radioactivity?
A point charge is taken from a point A to a point B in an electric field. Does the work done by the electric field depend on the path of the charge?
A pendulum having time period equal to two seconds is called a seconds pendulum. Those used in pendulum clocks are of this type. Find, the length of a seconds pendulum at a place where $\text{g}=\pi^2\text{m/s}^2.$
→Two crystals $C _1$ and $C _2$, made of pure silicon, are doped with arsenic and aluminium respectively.
a. Identify the extrinsic semiconductors so formed.
b. Why is doping of intrinsic semiconductors necessary?
→a. Identify the extrinsic semiconductors so formed.
b. Why is doping of intrinsic semiconductors necessary?
What is a filter circuit? Explain its functioning.
Can a metallic sphere of radius 1 cm acquire a charge of 1 Coulomb?
Name the semiconductor device that can be used to regulate an unregulated dc power supply. With the help of I-V characteristics of this device, explain its working principle.