Hello! The answer to this question is H, can I ask why?
Hi!
P is an ammeter since it’s connected in series
Q and R are voltmeters since they are connected in parallel
I don’t know the technique to solve these questions, but here is my try at it:
with an open switch we have the current passing through two resistances
with a closed switch the current chooses the path of least resistance and we only have one resistance in effect in the circuit
at P: we go from I=V/2R to I=V/1R so the current will increase
at Q: in series the voltage is shared among the resistors, when the switch is closed the voltage doubles since we only have one resistor left. So the voltage will increase
at R: when the switch is closed we go from a series to parallel circuit at R.
in parallel circuits the current splits, we go from V=IR to V/2=I/2 * R so the voltage will decrease
Please let me know if i made a mistake or if there is a simpler way of reasoning!
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