InterviewSolution
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InterviewSolution
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A hot plate of an electric oven connected to a `220 V` lines has two resistance coils `A and B`, each of `24 Omega` resistance, which may be used separately, in series or in parallel. What are the currents in the three cases ? |
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Answer» Here, potential difference, `V = 220 V` resistance of each coil, `r = 24 Omega` (i) When each of the coils `A or B` is connected separately, current through each coil, i.e., `I = (V)/( r) = (220 V)/(24 Omega) = 9.2 A` (ii) When coils `A and B` are connected in series, equivalent resistance in the circuit, `R_s = r + r = 2r = 48 Omega` Current through the series combination, i.e., `I_s = (V)/(R_s)=(220 V)/(48 Omega) = 4.6 A` (iii) When the coils `A and B` are connected in parallel, equivalent resistance in the circuit, `R_p = ( r)/(2) = (24 Omega)/(2) = 12 Omega` Current through the parallel combination, i.e., `I_p = (V)/(R_p) = (220 V)/(12 Omega) = 18.3 A`. |
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