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A carbon resistor is coloured with four different bandsred, green, orange and silver respectively. Find the range of its probable resistance. Or, EMF of an electrical cell is 2 volt. A 10Omega resistance is joined at its two ends then potential difference is measured 1.6 volt. Find out the internal resistance and lost volt. |
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Answer» Solution :Red : 2, GREEN : 5, orange:3,zeroes, silver: 10% error `therefore` RESISTANCE = 25000`pm 10% Omega` ` 10% of 25000 Omega = 2500Omega` `therefore`Range of the resistance = (25000 - 2500) to (25000 + 2500) =22500`Omega` to 27500`Omega` Or, LOST VOLT = 2 - 1.6 = 0.4 V Current through this circuit , `I = (1.6 V)/(10Omega) = 0.16 A` Internal resistance, `r = (Ir)/(I) = (" lost volt")/(I) = (0.4V)/(0.16 A) = 2.5 Omega` |
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