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Combination of Resistors GCSE Physics
single resistor 2 resistors in parallel 2 resistors in series 3 resistors in series 3 resistors in parallel Increasing resistance
[object Object],[object Object],More about resistance... R total  = R 1  + R 2 R 1  x R 2 R 1  + R 2 R total  = R 1 R 2 R 1 R 2
 
Example Questions ,[object Object],5 Ω a) 7 Ω R total  = R 1  + R 2 = 5 + 7  =12 Ω 12 Ω 4 Ω b) R 1  x R 2 R 1  + R 2 R total  = = 12 x 4 / (12 + 4) = 48 / 16 = 3 Ω
6Ω 2Ω 7Ω c) R 1  x R 2 R 1  + R 2 R total  = = 6 x 2 / (6 + 2) = 12 / 8 = 1.5 Ω Calculate the resistance of the parallel section first… 1.5Ω 7Ω This now simplifies the combination to this… R total  = R 1  + R 2 = 1.5 + 7 = 8.5 Ω ,[object Object],g) – j)
Practise Questions ,[object Object],[object Object],R total  = R 1  + R 2 R 1  x R 2 R 1  + R 2 R total  = Series Parallel
Remember this example question: V 1 V 2 6 V 3 A A 1 A 2 V 3 A 3 What is the easiest path for the Coulombs of Charge? All bulbs are identical in power rating

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Resistor combinations

  • 2. single resistor 2 resistors in parallel 2 resistors in series 3 resistors in series 3 resistors in parallel Increasing resistance
  • 3.
  • 4.  
  • 5.
  • 6.
  • 7.
  • 8. Remember this example question: V 1 V 2 6 V 3 A A 1 A 2 V 3 A 3 What is the easiest path for the Coulombs of Charge? All bulbs are identical in power rating