Doubt in Ammeter: Shunt Resistor or Inductance?

  • Context: Undergrad 
  • Thread starter Thread starter snb
  • Start date Start date
  • Tags Tags
    Ammeter Doubt
Click For Summary
SUMMARY

The discussion centers on the function of a shunt resistor in an ammeter, specifically addressing the presence of a wound wire across the terminals. The consensus is that the wire serves as a shunt resistor, enhancing the meter's sensitivity, which is approximately 1000 times greater than the current being measured. Additionally, it is established that at low frequencies, the inductance introduced by the few turns of wire is negligible and does not affect the ammeter's performance, distinguishing it from RF ammeters that operate on different principles.

PREREQUISITES
  • Understanding of ammeter functionality
  • Knowledge of shunt resistor principles
  • Familiarity with electrical inductance concepts
  • Basic principles of low-frequency electrical measurements
NEXT STEPS
  • Research the design and operation of shunt resistors in ammeters
  • Explore the differences between RF ammeters and standard ammeters
  • Study the impact of inductance in low-frequency circuits
  • Learn about the sensitivity specifications of various ammeter models
USEFUL FOR

Electronics enthusiasts, electrical engineers, and students studying measurement techniques in electrical circuits.

snb
Messages
4
Reaction score
0
The other day I happened to open an ammeter just out of curiosity.
What I saw was that across the positive and negative terminals a wire of considerable thickness(almost equal to the thickness of wires we use for household joints) was wound..It just had 4 or 5 turns.
I guess it should be the shunt resistor (though it wasn't a "resistor" also there was no resistor in series )...but then the fact that the wire was wound brought to my mind a doubt whether inductance has any role to play in it ?
Am I right ?
 
Physics news on Phys.org
Yes, it was a shunt resistor as the meter movement was probably 1000 times more sensitive than 'amps'.

No, at the low frequencies the meter was designed for, the inductance of a few turns makes no difference. RF ammeters work on entirely different principles.

go well
 

Similar threads

Undergrad Building a Linear Induction Motor | Tips & Tricks
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad Physics domain analysis of Voltage drop in series resistor
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Voltage drop across a capacitor and resistor in series
  • · Replies 19 ·
Replies
19
Views
5K
Mosfet SSR, flyback shunt/crowbar safety circuit
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Theoretical doubt regarding capacitance
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Mystery Voltage: Investigating a Strange Phenomenon in MHD Testing
  • · Replies 6 ·
Replies
6
Views
2K
Completely solar powered engine -- is my design good?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Can someone me understand voltage
  • · Replies 2 ·
Replies
2
Views
2K
Capacitive/inductive reactance in a series-parallel circuit
  • · Replies 6 ·
Replies
6
Views
3K
Calculating inductance using a RL circuit and a frequency generator
  • · Replies 10 ·
Replies
10
Views
6K