How to Correctly Position an Ammeter to Measure Headlight Current?

[dasblack]

Homework Statement

The manufacturer of a 12V car headlight specifies it will draw a current of 6A. You would like to check this claim with an ammeter designed to measure currents up to 10A and having a resistance of 0.1 Ohms. Which of the two figures below represents a circuit where the ammeter correctly measures the current in the headlight?
a). How much current (in A) would flow in the ammeter for Circuit a?
b.)How much current (in A) would flow in the ammeter for Circuit b?

Homework Equations

delta(V) = IR

The Attempt at a Solution

Circuit a should be the ammeter measurement
a.)I = 12/0.1 = 120
b.)I = 12/.01 = 120

 

[tiny-tim]

delta(V) = IR
…
Circuit a should be the ammeter measurement
a.)I = 12/0.1 = 120
b.)I = 12/.01 = 120

Hi dasblack!

Yes, circuit a.

But you haven't used the resistance of the headlamp …

what should you assume it is (from the manufacturer's specification)?