How much current (in A) flows through the ammeter for Circuit b?

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SUMMARY

The discussion centers on measuring the current flowing through a 12V car headlight rated at 6A using an ammeter with a maximum capacity of 10A and a resistance of 0.1 Ohms. The correct circuit configuration for accurate measurement is Circuit b, as ammeters must be connected in series with the load. The total resistance in the circuit, including the headlight's resistance of 2 Ohms, results in a current slightly less than 6A when measured. The calculation for current using Ohm's Law (I = V/R) must consider the total resistance of the circuit.

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  • Understanding of Ohm's Law (V = IR)
  • Knowledge of series circuits and their resistance calculations
  • Familiarity with ammeter usage and specifications
  • Basic electrical concepts related to voltage, current, and resistance
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  • Calculate the total current in a series circuit with varying resistances
  • Explore the specifications and limitations of different types of ammeters
  • Learn about the impact of resistance on current flow in electrical circuits
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kapopka88
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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?
OA-Ammeter.bmp

a. Circuit a.
b. Circuit b.

How much current (in A) would flow in the ammeter for Circuit a?

i thought A would equal V/R, which in this case i thought would be 12/.1= 120 amps... but this is not correct. please help!

How much current (in A) flows through the ammeter for Circuit b?
 

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The pictures haven't authenticated yet, but ammeters are used in series with the load (headlight) so that the combined resistance of the circuit is 0.1ohm + the resistance of the headlight which is supposedly 12V/6A = 2ohm. If the headlight truly is 2ohm, you should see slightly less current than 6A with the ammeter hooked up (it's your job to find how much though).
 

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