Electrical Engineering XYZ MCQs
The internal resistance of a milli-ammeter must be very low. This is primarily because of:
- High accuracy
- Minimum effect on the current in the circuit
- High sensitivity
- High precision
Correct answer: 2. Minimum effect on the current in the circuit
Explanation: The internal resistance of a milli-ammeter (or ammeter) must be very low primarily because it minimizes the effect on the current in the circuit being measured. An ideal ammeter should have negligible resistance so that it doesn’t significantly alter the current it is supposed to measure. If the internal resistance of the ammeter were high, it would draw a significant amount of current from the circuit, leading to inaccurate readings and affecting the behavior of the circuit under measurement.
Therefore, the low internal resistance ensures that the ammeter has minimum impact on the circuit it is connected to, allowing for accurate current measurements without disturbing the circuit’s normal operation.