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The range of voltmeter is 10V and its internal resistance is 50Ω. To convert it to a voltmeter of range 15V, how much resistance is to be added?
Options
(a) Add 25Ω resistor is parallel
(b) Add 25Ω resistor is series
(c) Add 125Ω resistor in parallel
(d) Add 125Ω resistor in series
Correct Answer:
Add 25Ω resistor is series
Explanation:
The current in case of voltmeter range 10 V and resistance 50 Ω is I = 10 / 50 —–(i)
Let X is the resistance conneced in order to make a voltmeter with range 15 V is I = 15 / X —-(ii)
Equating equation (i) and (ii), we get
15 / X = 10 / 50 ⇒ X = (15 × 50) = 75 Ω
Then, R = 75 – 50 = 25 Ω must be connected in series, because V ∝ R when current is constant.
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which logic gate is represented by the following combination of logic gate?
- Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life
- The breaking stress of a wire depends upon
- A p-n-p transistor is used in common emitter mode in an amplifier circuit.
- A bullet comes out of the barrel of gun of length 2m with a speed of 800 m/s
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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