When you use an instrument like an Ammeter to measure current in an electrical circuit the  measured value of the current is not the actual value of the current. What is the main reason for this?  State a mathematical expression that can be used to measure this effect. What measure would you  take to reduce this problem?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter17: Resistive-inductive Series Circuits
Section: Chapter Questions
Problem 1PA: An AC electric motor is connected to a 240-V, 60-Hz source. A clamp-on ammeter with a peak hold...
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b. When you use an instrument like an Ammeter to measure current in an electrical circuit the 
measured value of the current is not the actual value of the current. What is the main reason for this? 
State a mathematical expression that can be used to measure this effect. What measure would you 
take to reduce this problem?

c. An Ammeter with an Internal resistance 200Ω is used to measure the current in a circuit with three 
resistances in series. The values of the three resistances are 100Ω, 200Ω and 400Ω respectively. 
There is a single power supply with a value of 12V connected in series with the three resistors. 
Using the expression you have stated in (b) obtain the loading effect when measuring the current 
of this circuit.

When you use an instrument like an Ammeter to measure current in an electrical circuit the
measured value of the current is not the actual value of the current. What is the main reason for this?
State a mathematical expression that can be used to measure this effect. What measure would you
take to reduce this problem?
An Ammeter with an Internal resistance 200 2 is used to measure the current in a circuit with three
resistances in series. The values of the three resistances are 1002, 2002 and 400 2 respectively.
There is a single power supply with a value of 12V connected in series with the three resistors.
Using the expression you have stated in (b) obtain the loading effect when measuring the current
of this circuit.
Transcribed Image Text:When you use an instrument like an Ammeter to measure current in an electrical circuit the measured value of the current is not the actual value of the current. What is the main reason for this? State a mathematical expression that can be used to measure this effect. What measure would you take to reduce this problem? An Ammeter with an Internal resistance 200 2 is used to measure the current in a circuit with three resistances in series. The values of the three resistances are 1002, 2002 and 400 2 respectively. There is a single power supply with a value of 12V connected in series with the three resistors. Using the expression you have stated in (b) obtain the loading effect when measuring the current of this circuit.
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