A moving-coil meter, with internal resistance .

Did you forget to include the diagram? In summary, a voltmeter is created by placing a moving-coil meter with internal resistance of 15 Ω and a resistor in series. To measure voltages in the range 0 - 14 V, the required value for the series resistor is calculated by using the full-scale deflection current of 13 mA and a 14 V source.
  • #1
cluelesseng
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A moving-coil meter, with internal resistance...

Homework Statement



A moving-coil meter, with internal resistance Rmeter = 15 Ω produces full-scale deflection for a current of 13 mA. Design a voltmeter, as shown below, which can measure voltages in the range 0 - 14 V. What is the required value for Rseries?

Homework Equations





The Attempt at a Solution

 
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  • #2


Basically it's asking you to put the moving coil current meter into a box together with a resistor so you can call the whole thing a voltmeter.

Draw the circuit and show it connected to a 14 V source/battery. Use what you know to work out what value of R gives full scale deflection whan connected to 14V.

Come back if you are stuck.
 
  • #3


Voltmeter "as shown below"?
 

FAQ: A moving-coil meter, with internal resistance .

What is a moving-coil meter?

A moving-coil meter is a type of instrument used for measuring electrical current. It consists of a coil of wire suspended between two magnets, which produces a torque that causes the coil to rotate when an electrical current is passed through it.

How does a moving-coil meter work?

A moving-coil meter works by using the interaction between a magnetic field and an electrical current to produce a measured movement. When an electrical current flows through the coil, it creates a magnetic field that interacts with the fixed magnets and causes the coil to rotate. The amount of rotation is proportional to the strength of the current.

What is the purpose of the internal resistance in a moving-coil meter?

The internal resistance in a moving-coil meter is used to limit the amount of current flowing through the coil. This helps to protect the instrument from damage and ensures that the measured current is accurate.

How is the internal resistance of a moving-coil meter determined?

The internal resistance of a moving-coil meter is determined by the material used to make the coil, the number of turns in the coil, and the thickness and length of the wire. These factors affect the electrical resistance of the coil and ultimately determine the internal resistance of the meter.

What are the advantages of using a moving-coil meter?

A moving-coil meter is highly accurate, has a wide measurement range, and can be used to measure both AC and DC currents. It also has a low power consumption and is relatively inexpensive compared to other types of electrical measurement instruments.

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