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The questions is: the two resistors are now connected in parallel. Calculate the new reading on the ammeter when S is closed, stating clearly any equations the you use.
The voltage is 12V
The resistor readings are: 16 omhs and 8 omhs
1/ (1/16 + 1/8) = 16/3 Ohms ....which is the total resistance in the circuit.
12/(16/3) = 2.25A