Rob asked in Science & MathematicsPhysics · 1 decade ago

To make a galvanometer into an ammeter, connect:?

A) a high resistance in parallel

B) a high resistance in series

C) a low resistance in series

D) a low resistance in parallel

E) a source of emf in series

Please elaborate

5 Answers

Relevance
  • Anonymous
    1 decade ago
    Favorite Answer

    The galvanometer is a very sensitive type of ammeter anyway, typically measuring currents in the order of micro- amps. The question is a bit ambiguous, but I'm going to approach it by assuming you mean that you want to turn a micro-ammeter into a ammeter measuring many amps, although quite why you would want to do it this is a bit iffy.

    To turn any micro- ammeter into a ammeter you would need to connect a low value resistance in parallel with the micro-ammeter. In this way, a large current will be divided into two with only a small amount going through the galvo but the vast majority of it going through the low resistance path of the resistor placed in parallel with it.

    So, I would say: D.

    Putting a resistor in series with an ammeter will create a voltmeter.

  • kildow
    Lv 4
    4 years ago

    How To Make A Galvanometer

  • Anonymous
    4 years ago

    The point about the shunt resistor is that it should be very much greater than the resistance of the galvanometer so that the current is draws in negligible compared to the current through the galvanometer. You can confirm this by measuring the voltage across the parallel combination and then calculating the current in each. You can also calibrate the galvanometer in this way.

  • 1 decade ago

    A galvanometer is a type of ammeter to begin with. You don't need to do anything specific to make it one. A property of ammeters is that they ideally have zero resistance, and they are operated in series, so I'd go with C, even though the question is questionable.

  • How do you think about the answers? You can sign in to vote the answer.
  • 1 decade ago

    C) a low resistance in series

    Although there probably already is a low resistance in series, because it is already part of the galvanometer's coils.

    The component labeled A is the ammeter:

    http://img94.imageshack.us/img94/2024/4probemeasur...

    You want your ammeter to be connected such that it interrupts the current flowing through the circuit, without changing its voltage significantly.

Still have questions? Get your answers by asking now.