Question

The range of voltmeter of resistance 200ohm is increased from 5V to 30V. It can be done by connecting?
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Answer 1

Answer:

To increase range of voltmeter we have to put a resistance in series of voltmeter

To increase range of ameter we have put resistance in parallel to ameter

Explanation:

For this question :

• as this voltmeter can only take load upto 5 v beyond this , this voltmeter will damage so current through voltmeter = V / R = 5/ 200 = 0.025 A
• 0.025 is maximum current through circuit

Required resistance

• V = I × R
• R = V ( remaning voltage ) / I
• R = 30 - 5 / 0.025 = 1000 ohm