What condition exists when the insertion of a meter into a circuit changes the operation of the circuit?

What condition exists when the insertion of a meter into a  circuit changes the operation of the circuit?
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Meter-loading.
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What type of meter is shown and what is the value of the quantity being measured for each meter in figure1-49?

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What is the quantity shown on the watt-hour meter in figure 1-46?

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What electrical quantity is measured by a watt-hour meter?

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What type of meter movement reacts to voltage rather than current?

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How is it possible to use a current sensitive meter movement to measure voltage?

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What electrical property is used by all the meter movements discussed so far?

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List three meter movements that can measure either ac or dc without the use of a rectifier.

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What value is indicated on the scale of an ac meter?

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What value does a meter movement react to (actually measure) when measuring ac?

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What are two methods used to damp a meter movement?

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Last Answer : As the coil moves through the field of the permanent magnet, a current is induced in the coil opposing the movement of the coil; and a vane can be attached to the coil and placed in the airtight chamber so that the movement of the vane opposes the movement of the coil.

How can a d’Arsonval meter movement be adapted for use as an ac meter?

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Last Answer : By the use of a rectifier

What is the purpose of a rectifier in a meter?

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Last Answer : A rectifier changes alternating current to pulsating direct current and allows a dc meter to measure ac.

What are three functions of the hairsprings in a d’Arsonval meter movement?

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Last Answer : To return the pointer to its rest position when there is no current flow; to oppose the coil movement when there is current flow; to provide electrical connections for the coil.

What is the effect of current flow through the coil in a d’Arsonval meter movement?

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Last Answer : A magnetic field is generated around the coil and the attraction of this field with the permanent magnet causes the coil to move