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Why should an ammeter have low resistance?

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प्रश्न

Why should an ammeter have low resistance?

थोडक्यात उत्तर
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उत्तर

An ammeter has a low resistance, which makes it easy for all the current to flow through the circuit without energy loss from heat losses. This means that it does not impede or alter the flow of electric current.

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2022-2023 (March) Delhi Set 1

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

Graph showing the variation of current versus voltage for a material Ga As is shown in the figure. Identify the region of
(i) negative resistance

(ii) where Ohm's law is obeyed.


Write the formula of resistivity


Fill in the following blank with suitable words: 

Resistance is measured in .............. The resistance of a wire increases as the length ..............; as the temperature ..............; and as the cross-sectional area .............. .


Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance? 

 


What is meant by the drift speed of free electrons?


The ratio of the potential difference to the current is known as ________.


Explain the equivalent resistance of a parallel resistor network.


Which of the following I-V graph represents ohmic conductors?


A metal rod of length 10 cm and a rectangular cross-section of 1 cm × `1/2` cm is connected to a battery across opposite faces. The resistance will be ______.


The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare:

  1. the resistance in both the cases.
  2. the voltmeter readings in both the cases.
  3. the specific resistance in both the cases.

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