The Student Room Group

A level physics electricity question(1)

For questions b I’m confused on why my working wrong. I thought the current is the same for all components in series? I assume it has something to do with the non ideal resistor but I don’t understand how that works ? And therefore how that affects my calculations?C41269A0-2663-4C3D-95F2-747BBEC5BA6E.jpeg

also for the non ideal voltmeter:
-does it have it's own voltage, current and resistance values ?
-so do I just basically treat it as a normal component in a circuit for when it comes to calculations ?

(The green in from the markscheme)
(edited 1 month ago)
Original post by 1234kelly
For questions b I’m confused on why my working wrong. I thought the current is the same for all components in series? I assume it has something to do with the non ideal resistor but I don’t understand how that works ? And therefore how that affects my calculations?C41269A0-2663-4C3D-95F2-747BBEC5BA6E.jpeg
also for the non ideal voltmeter:
-does it have it's own voltage, current and resistance values ?
-so do I just basically treat it as a normal component in a circuit for when it comes to calculations ?
(The green in from the markscheme)

Yeah for a non-ideal voltmeter, we consider it as a resistor in parallel.
For more context, an ideal voltmeter has an infinite resistance hence a non-ideal voltmeter has a smaller resistance, hence it has some current passing through it as current is inversely proportional to resistance.
(edited 1 month ago)
Reply 2
Original post by WordsFiddle
Yeah for a non-ideal voltmeter, we consider it as a resistor in parallel.
For more context, an ideal voltmeter has an infinite resistance hence a non-ideal voltmeter has a smaller resistance, hence it has some current passing through it as current is inversely proportional to resistance.

Thank you for clearing that up ! So if it has a I and V does it mean it have a voltage as well ? If so does its voltage change depending on what it’s connected to ? Furthermore does its I and V values change depending on what component it’s connected parallel to ?
Original post by 1234kelly
Thank you for clearing that up ! So if it has a I and V does it mean it have a voltage as well ? If so does its voltage change depending on what it’s connected to ? Furthermore does its I and V values change depending on what component it’s connected parallel to ?
The voltage and current will change as they do for resistors in parallel...change the component in series and the voltage changes, change the component in parallel and current in voltmeter changes. And yes it does have a voltage.
Reply 4
and just to double check it's voltage would just be whatever it's connected parallel to right ?
Original post by 1234kelly
and just to double check it's voltage would just be whatever it's connected parallel to right ?

yes

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