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# Resistor combinations

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### Resistor combinations

1. 1. Combination of Resistors GCSE Physics
2. 2. single resistor 2 resistors in parallel 2 resistors in series 3 resistors in series 3 resistors in parallel Increasing resistance
3. 3. <ul><li>Resistors in series </li></ul><ul><li>Resistors in parallel </li></ul>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
4. 5. Example Questions <ul><li>Calculate the resistance of the following combination of resistors- </li></ul>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
5. 6. 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 <ul><li>Pg 131, Q26 </li></ul>g) – j)
6. 7. Practise Questions <ul><li>Pg 131, Q26 </li></ul><ul><li>Remember the equations- </li></ul>R total = R 1 + R 2 R 1 x R 2 R 1 + R 2 R total = Series Parallel
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
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