Question:

A galvanometer acting as a voltmeter should have

Updated On: Jun 23, 2023
  • low resistance in series with its coil
  • low resistance in parallel with its coil
  • high resistance in series with its coil
  • high resistance in parallel with its coil
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The Correct Option is C

Solution and Explanation

Galvanometer is a very sensitive instrument. Only a small current is required to cause notable deflections in the dial. A voltmeter will be added in parallel between the points across which we intend to measure the voltage drop. So the galvanometer will be directly exposed to the same voltage which is being measured. Therefore, to prevent the damage to the instrument, only a small current needs to be passed through it. This is achieved by putting a high resistance in series with the galvanometer coil.
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Concepts Used:

Current Electricity

Current electricity is defined as the flow of electrons from one section of the circuit to another.

Types of Current Electricity

There are two types of current electricity as follows:

Direct Current

The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.

Alternating Current

The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.