Question
State the use of galvanometer as a voltmeter.
✓
Answer
→A galvanometer can also be used as a voltmeter.
→For using galvanometer as a voltmeter it is connected in parallel with that component of the circuit.
→A galvanometer is a very sensitive device, so to avoid damage the current passing through it should be very small.
→For this a large resistance is connected in series with galvanometer, as shown in the figure.
→The resistance of voltmeter is $R _{ G }+ R$
But $R \gg R _{ G }$,
→So, $R _{ G }$ can be neglected as compare to R so the resistance of the voltmeter becomes $\approx R$.
→For using galvanometer as a voltmeter it is connected in parallel with that component of the circuit.
→A galvanometer is a very sensitive device, so to avoid damage the current passing through it should be very small.
→For this a large resistance is connected in series with galvanometer, as shown in the figure.
→The resistance of voltmeter is $R _{ G }+ R$
But $R \gg R _{ G }$,
→So, $R _{ G }$ can be neglected as compare to R so the resistance of the voltmeter becomes $\approx R$.
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
A farsighted person cannot see objects placed closer to 50cm. Find the power of the lens needed to see the objects at 20cm.
The short wavelength limit for the Lyman series of the hydrogen spectrum is 913·4 $\mathring{\text{A}}$ Calculate the short wavelength limit for Balmer series of the hydrogen spectrum.
→Light from Balmer series of hydrogen is able to eject photoelectrons from a metal. What can be the maximum work function of the metal?
Can a plane mirror ever form a real image?
Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards. A current in the coil produces a deflection of 3.5° of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?
Explain : "Electric charges are additive in nature."
- Why are infra-red waves often called heat waves? Explain.
- What do you understand by the statement, ‘‘Electromagnetic waves transport momentum’’?
How the speed of revolving electron in stable orbit is related to principal quantum number?
Find the wavelength of electromagnetic waves of frequency 4 × 109Hz in free space. Give its two applications.
What is the ratio of first excited state and corresponding orbital radius of ground state in hydrogen atom?