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A battery of emf 100V and a resistor of resistance 10k(Omega)are joind in series. This system is used as a source to supply current to an external resistance R. If R is not greater than 100(Omega), the current through it is constant up to two significant digits.Find its value, This is the basic principle of a constant-current source. |
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Answer» Solution :`E = 100 volt, R' = ` 100 K Omega = 100000 Omega`, ` R=1 UPTO 100 ` ` when no other register is added or r =0 ` ` i= E/R = 100/10000 = 0.001 Amp.` ` when r = 1` ` i= (100/100000+1) = 100/100001` ` = 0.000999A` up tor = 100, the CURRENT does not up to two SIGNIFICANT digits. Thus it is proved. |
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