Question 518: Current Electricity

Question

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

Accepted Answer

To convert a galvanometer into an ammeter or voltmeter, we need to consider how resistance affects each device.
For a
voltmeter
, it is important to have
high resistance
because the resistance ($R$) is added in series with the galvanometer. Increasing the resistance extends the range of the voltmeter. Thus, to achieve a higher voltage range, the resistance must be increased.
Consequently, a voltmeter with a range of
10 V
will have the largest resistance compared to the other options because higher voltage ranges require higher resistance.

Answer

Ammeter of range 1 A

Answer

Ammeter of range 10 A

Answer

Voltmeter of range 1 V

Answer

Voltmeter of range 10 V

Current Electricity

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

Choose the correct answer: