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posted by  bhe on 10/12/2008 4:24:46 AM  |  status: Live  

PLEASE i need HELP.. ELECTRONICS PROBLEMS..

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 2. what device is used to extend the range of the DC voltmeter and how is it connected to the basic meter? and  what device is used to extend the range of the DC ammeter and how is it connected to the basic meter?

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posted by Shree_vani on 10/12/2008 6:34:47 AM  |  status: Live
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"thanks!!"
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To extend the range of a DC voltmeter, a suitable high resistance is connected in series with the meter
 
Rs = (V - Vv) / Iv
 
To extend the range of a DC ammeter, a suitable low resistance is connected in parallel with the meter
 
Rsh = Ia Ra / (I - Ia)
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