Question

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

Answer 1

Answer:

current in three cases are respectively 9.17A(used only A or B),4.58A (when resistors are connected series) and 18.3A(when resistors are connected in parallel)

Explanation:

Case 1

V is 220V and R is 24ohm

I=220÷24 or 9.17ohm

Case 2

V is 220 V and R is 24+24or 48 ohm

I=220÷48 or 4.58 ohm

Case 3

V is 220 V

1/R=1/24+1/24 or R=12ohm

I=220÷12 or18.3ohm

Answer 2

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