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ameter has a low resistance so if it is placed in parallel with the load then it will experiance voltage as much as the load and according to equation

power=v2/r

the power will be very high as high v or low r both favors for a high power dissipation .

but on a series combination most of the voltage drop will be on load the ameter will not have a high power dissipation

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Q: Why an ammeter is likely to burn out if connected in parallel combination?
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