# CAN SOMEONE DO THIS AS LEVEL PHYSICS EXAM QUESTION on effective resistanceWatch

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#1
0
4 weeks ago
#2
What have you tried? Try looking at the diagram carefully - look at the right first
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#3
i dont really get it at all please do it if possible
0
4 weeks ago
#4
The LHS is a short circuit, so there's no resistance there.
The RHS comes down to 3 resistors in parallel.
1
4 weeks ago
#5
You can Ignore the first part of the circuit as there is no resistance. To work out the resistance in the second part of the circuit you can use the equation for resistors in parallel: 1/RT = 1/R1 + 1/R2 + 1/R3.

1) 1/7 + 1/3 + 1/(4+8) = 0.5595
2) 0.5595^-1 = 1.79

So the answer should be B 1.8
0
#6
ok thanks i get it now
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