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AP EAMCET202124 Aug 2021Evening ShiftPhysicsCurrent ElectricityActual

A galvanometer may be converted into ammeter or a voltmeter. In which of the following cases the resistance of the devices, so obtained will be largest?

Options

  1. AAmmeter of range 1 ~A
  2. BAmmeter of range 10 ~A
  3. CVoltmeter of range 1 ~V
  4. DVoltmeter of range 10 ~V

Correct answer

D. Voltmeter of range 10 ~V

Step-by-step solution

We know that, to convert a galvanometer in ammeter, a very small resistance is connected in parallel, so that equivalent resistance becomes small. Whereas, to convert a galvanometer into voltmeter of greater range, a high resistance is connected in series. To get high range voltmeter, high resistance is required.

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