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An electrical meter of internal resistance 20 gives a full scale deflection when one milliampere current flows through it. The maximum current, that can be measured by using three resistors of resistance 12 each, in milliamperes is
  • a)
    10
  • b)
    8
  • c)
    6
  • d)
    4
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
An electrical meter of internal resistance 20 Ω gives a full sc...
Given data:
- Internal resistance of the electrical meter = 20 Ω
- Full scale deflection current = 1 mA

Calculating maximum current:
- Total resistance in the circuit = 3 resistors of 12 Ω each in parallel
- 1/R_total = 1/12 + 1/12 + 1/12 = 3/12
- R_total = 4 Ω
- Maximum current that can be measured = V/R_total
- V = IR = 1 mA * 20 Ω = 20 mV
- Maximum current = 20 mV / 4 Ω = 5 mA = 5 milliamperes
Therefore, the maximum current that can be measured using three resistors of resistance 12 Ω each is 6 milliamperes (option c).
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An electrical meter of internal resistance 20 Ω gives a full scale deflection when one milliampere current flows through it. The maximum current, that can be measured by using three resistors of resistance 12 Ω each, in milliamperes isa) 10 b) 8 c) 6 d) 4 Correct answer is option 'C'. Can you explain this answer?
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