Question

The net resistance of an ammeter should be small to ensure that

• A. it does not get overheated.
• B. it does not draw excessive current.
• C. it can measure large currents.
• D. it does not appreciably change the current to be measured.

Answer 1

The correct option is D it does not appreciably change the current to be measured.

Ammeter is used to measure the current through the circuit. If ammeter have some (finite) resistance, the reading of current through the ammeter will be less than actual (value of) current flowing through circuit. Hence, smaller the net resistance of an ammeter more accurate will be its reading.