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Series resistance required to read 0−250 V with a moving coil instrument of internal resistance 2 ohm and full scale deflection of 50 mA is:
- a)49998Ω
- b)4998Ω
- c)498Ω
- d)49.8Ω
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Series resistance required to read0−250Vwith a moving coil instr...
Given:
A Voltmeter with Rm = 2Ω
Vnew = 250V
Ifs = 50mA
We know that,
Rse = Rm(m−1)
Where,
Rse = Series resistance
Rm = Meter resistance
m = Vnew/Vm
Vnew = Maximum voltage across the meter after extending the range.
Vm = Meter voltage
∵Vm = Ifs×Rm
= 50mA ×2Ω
Vm = 0.1V
m = 250/0.1 = 2500
According to using the given formula,
Rse = 2(2500-1) = 4998Ω
A Voltmeter with Rm = 2Ω
Vnew = 250V
Ifs = 50mA
We know that,
Rse = Rm(m−1)
Where,
Rse = Series resistance
Rm = Meter resistance
m = Vnew/Vm
Vnew = Maximum voltage across the meter after extending the range.
Vm = Meter voltage
∵Vm = Ifs×Rm
= 50mA ×2Ω
Vm = 0.1V
m
= Vnew/Vmm = 250/0.1 = 2500
According to using the given formula,
Rse = 2(2500-1) = 4998Ω
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Series resistance required to read0−250Vwith a moving coil instrument of internal resistance2ohmand full scale deflection of50mAis:a)49998Ωb)4998Ωc)498Ωd)49.8ΩCorrect answer is option 'B'. Can you explain this answer?
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