The Student Room Group

Weird current question?



How would you go about solving this? its supposed to be simple?
Reply 1
This is Kirschoff's law - No charge, and so current, accumulates at a node (junction between wires). So the sum of all the currents going in must equal to the sum of all the currents going out.
I stands for current

Its not A becuase that says - I2+I3+I4=I1

Its not B because that says - I1+I4=I2+I3

Its not D because that says - I1=I2+I3+I4

Its C becuase the current comes from I1 and I2 to meet at the middle and leaves at I3 and I4 directing away from the middle
Reply 3
Long story short:
Magnitude of Inwards arrows must equal Magnitude of Outwards arrows

Edit: Relative to the node. :smile:
(edited 11 years ago)
Reply 4
Original post by BonjournoDeano
I stands for current

Its not A becuase that says - I2+I3+I4=I1

Its not B because that says - I1+I4=I2+I3

Its not D because that says - I1=I2+I3+I4

Its C becuase the current comes from I1 and I2 to meet at the middle and leaves at I3 and I4 directing away from the middle

Oh! Thanks :biggrin:
Reply 5
Original post by tamimi
Long story short:
Magnitude of Inwards arrows must equal Magnitude of Outwards arrows

Edit: Relative to the node. :smile:



Original post by tory88
This is Kirschoff's law - No charge, and so current, accumulates at a node (junction between wires). So the sum of all the currents going in must equal to the sum of all the currents going out.


Thank you :smile:

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