Instrument placement (repeat) — to measure a branch current, an ammeter is placed in series with that branch; to measure the total current drawn from the supply, the ammeter is placed in series with the source lead.

Introduction / Context:
This is the same principle as earlier: current measurement requires insertion into the current path with minimal burden. The ammeter must be in series with the path whose current is measured.

Given Data / Assumptions:

• Ideal meter, negligible resistance.
• Parallel circuit drawing total current from a source.

Concept / Approach:
Series placement ensures the measured path’s current flows through the meter. For total current, place it in series with the source so every branch current sums through the meter.

Step-by-Step Solution:

Verification / Alternative check:
Sum of branch readings equals the total reading within meter tolerance.

Why Other Options Are Wrong:

Common Pitfalls:
Accidentally shorting a source by putting an ammeter across it.

Final Answer:
Series, series