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 three cases?<p></p>

Case 1: Coils used separately.
V = IR
220 = I * 24
I = 9.167 A

Case 2: Coils used in series
Req = R1 + R2 = 24 + 24 = 48 Ω
V = IReq
220 = I * 48
I = 4.583 A

Case 3: Coils used in parallel
1/Req = 1/R1 + 1/R2
Req = 12 Ω
V = IReq
220 = I * 12
I = 18.334 A

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