MHT CET · Physics · 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?
- A Ammeter of range 1 A
- B Ammeter of range 10 A
- C Voltmeter of range 1 V .
- D Voltmeter of range 10 V
Answer & Solution
Correct Answer
(D) Voltmeter of range 10 V
Step-by-step Solution
Detailed explanation
A voltmeter always has high resistance as R is in series.
To increase the range of voltmeter i.e., to increase V , its resistance must increase.
\(\therefore \quad\) High range \(\Rightarrow\) high resistance.
\(\therefore \quad\) Voltmeter of range 10 V has the largest resistance.
To increase the range of voltmeter i.e., to increase V , its resistance must increase.
\(\therefore \quad\) High range \(\Rightarrow\) high resistance.
\(\therefore \quad\) Voltmeter of range 10 V has the largest resistance.
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