THE PRACTICE STUDIO
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PRACTICE / Galvanometer conversion and sensitivity
Leave the coil only its rated current
A galvanometer has resistance 100 Ω and full-scale current 1.0 mA. A parallel shunt converts it into an ammeter with total full-scale current 1.0 A.
Which expression gives the exact shunt resistance under this ideal model?
Organize the givens & assumptions
- Rg = 100 Ω
- Ig = 0.001 A
- Target total current I = 1.0 A
Ideal resistive branches; coil current is exactly 1.0 mA at the desired full-scale total current; neglect heating changes.
- A
- B
- C
- D
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