A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 240 resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases ?

A hot plate of an electric oven connected to a 220 V line has two resi

1.	A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 240 resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases ?
Answer» Solution :V= 220 V R = 24 `Omega` (i) When TWO COILS are connected separately `I = (V)/(R) = (220)/(24)= 9.2 A ` (ii) When two coils are connected in series `R_(s)= 24 +24 = 48 Omega` `I = (V)/(R_(s))= (220)/(48) = 4.6 A ` When two coils are connected in parallel, the resistance of the combination is `(1)/(R_(p))=(1)/(24)+(1)/(24)=(1+1)/(24)=(2)/(24)=(1)/(12)` `R_(p) = 12 Omega` `I = (V)/(R_(p))=(220)/(12) = 18.3 A `