Electricity and Simple Circuits — O/L Science

How do I practise Electricity and Simple Circuits?

1 question with a worked solution · 7 marks

1. 2023 · Paper II · 7 marks
   Question 9 connects three resistors of stated values in parallel across a battery of stated voltage. It asks you to draw the circuit diagram, to calculate the total resistance of the combination, to calculate the total current drawn from the battery, and to state Ohm's Law.
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   (ii) 1/R_total = 1/4 + 1/6 + 1/12 = 3/12 + 2/12 + 1/12 = 6/12 → R_total = 2 Ω (iii) I = V / R = 12 / 2 = 6 A (iv) Ohm's Law: the current through a conductor is directly proportional to the potential difference across it, provided the temperature remains constant (V = IR).
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2023, Paper II, Question 9 · https://doenets.lk/pastpapers

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