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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 parallel. What are the currents in the three cases?
(i)Potential difference = 220 V,
resistance of each coil = 24 Ω
(ii)When Coil A and B are connected in series :
Rs = r + r
= 2r
= 48Ω
Current flowing :
IS = V/RS
IS = 220/48
IS = 4.58 A
(iii)When Coil A and B are connected in parallel :
RP = r/2
RP = 24/2
RP = 12Ω
Current flowing :
Ip = V/Rp
Ip = 220/12
Ip = 18.3Ω
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