A hot plate of an electric oven connected to a 220 V line has two resistance coils
A and B, each of 24 Ω resistance, which may be used separately, in series, or in
parallel. What are the currents in the three cases?

NCERT Class X
Science - Science

Chapter _Electricity

1

Answers

2015-06-03T01:14:15+05:30
Supply voltage, V = 220 VHere Resistance of one coil, R =24 Ω
(i) Coils are used separatelyAccording to Ohm’s law, V=I1R1 Iis the current flowing through the coilI1=V/R1=220/24=9.166A current flow through the coil when used separately is 9.16 A. (ii) Coils are connected in seriesR2=24 Ω+24 Ω=48 ΩAccording to Ohm’s lawI2=V/R2=220/48=4.58Athe current flowing through the series circuit is 4.58A(iii) Coils are connected in parallel 

According to Ohm’s lawI3=V/R3=220/12=18.33Athe current flowing through the parallel circuit is 18.33A
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