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Why Should the Resistance Of: a Voltmeter Be Very Large?

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प्रश्न

Why should the resistance of: 

a voltmeter be very large?

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उत्तर

A voltmeter should have a high resistance so that it can take only a negligible amount of current from the circuit.

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अध्याय 4: Electricity - Exercise 2 [पृष्ठ १९७]

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लखमीर सिंग Physics Part 1 [English] Class 10
अध्याय 4 Electricity
Exercise 2 | Q 20. (b) | पृष्ठ १९७

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

Calculate the number of electrons constituting one coulomb of charge.


Draw the electrical symbols of the following components and state its use:

Rheostat (variable resistance)


What is the Flow of Charge Called?


How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?


In the circuit diagram  given below, three resistors R1, R2, and R3 of 5 Ω, 10 Ω and 30 Ω, respectively are connected as shown 

  

Calculate:

  1. current through each resistor.
  2. total current in the circuit. 
  3. total resistance in the circuit.

Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line.

  1. Which circuit would have the highest voltage across each bulb?
  2. In which circuit would the bulbs be brighter?
  3. In which circuit, if one bulb blows out, all others will stop glowing?
  4. Which circuit would have less current in it?

Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance.   

(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?


What will be the current drawn by an electric bulb of 40 W when it is connected to a source of 220 V?

The following appliances are to be used on 240 V supply. Calculate the current used by each and say which fuse, 2 amp, 5 amp or 13 amp should be incorporated with each, (i) A television rated at 150 W, (ii) An electric iron rated at 750 W, (iii) An immersion heater rated at 3000 W, (iv) A hair dryer rated at 500 W. How much will it cost to run the television set for 100 days for an average of 4 hours a day at 60 paise per unit?


State the S.I. units of electrical power.


What should I choose ___________________

a. for decreasing resistance in a circuit.
(Resistors in series / Resistors in parallel)

b. for getting protection from electric current.
(Nickel / Ebonite)

c. to measure the current in the circuit?
(Ammeter/ Voltmeter) 

What is meant by internal resistance of a cell?


MCB is used to protect household electrical appliances.


The SI unit for electric current is the coulomb.


Electric current is defined as:


The electron was discovered in 1897 by:


In ionised gases (plasma), the charge carriers are:


In semiconductors, the charge carriers are:


The direction of Direct Current (DC) is characterized as:


The value used for practical measurement of Alternating Current is the:


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