In an electric circuit, what is the correct way to connect an ammeter?

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  1. In parallel with the source 
  2. In series with the component
  3. In parallel with the component 
  4. In either series or parallel

Answer (Detailed Solution Below)

Option 2 : In series with the component
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The correct answer is In series with the component.

Key Points

  • An ammeter is always connected in series with the component being measured to ensure that the entire current flows through the ammeter.
  • This connection allows the ammeter to accurately measure the current passing through the circuit.
  • Connecting an ammeter in parallel can result in damage to the ammeter due to excessive current flow, as its internal resistance is very low.
  • The low internal resistance of an ammeter is designed to minimize voltage drop across it, ensuring accurate current measurement.
  • Incorrect connections, such as in parallel, can also cause short circuits and disrupt the circuit's functionality.

Additional Information

  • Ammeter:
    • An ammeter is a device used to measure the electric current in a circuit.
    • It is calibrated in amperes (A), milliamperes (mA), or microamperes (μA).
  • Series Connection:
    • In a series connection, components are connected end-to-end so that the same current flows through each component.
    • This type of connection is crucial for devices like ammeters to measure current accurately.
  • Parallel Connection:
    • In a parallel connection, components are connected across the same two points, sharing the same voltage.
    • While suitable for devices like voltmeters, it is unsuitable for ammeters.
  • Internal Resistance of an Ammeter:
    • An ammeter has a very low internal resistance to avoid significant voltage drops across it.
    • This design allows it to measure current without affecting the circuit's operation.
  • Short Circuit:
    • A short circuit occurs when a low-resistance path bypasses a circuit's intended path, leading to excessive current flow.
    • Connecting an ammeter in parallel can result in a short circuit due to its low resistance.
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