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Overview of EMPA Exam Dates and Resistor Rules in Electricity

This document outlines important EMPA provisional dates including practical tasks on May 5th and a written paper on May 7th, followed by a Unit 1 exam on May 27th. Practice sessions with instructors Dr. Poulton and CJP are scheduled for the upcoming weeks. The lesson focuses on the rules for resistors in series and parallel circuits, emphasizing the potential difference and total resistance calculations. Key recap questions reinforce understanding of current behavior and potential difference across circuit elements, aiding students in their exam preparation.

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Overview of EMPA Exam Dates and Resistor Rules in Electricity

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  1. EMPA Information Provisional Dates:- Weds 5th May – Practical (Section A) – All Day (no time limit) consists of two tasks. Fri 7th May – Written Paper (Section B) 1hr 1/4. Remember Unit 1 exam is on Thursday 27th May.

  2. EMPA Practice Next week in Friday P1 with Dr. Poulton. Following week on Thursday P1 (BK) +P2 (CJP). More will follow...Don’t Panic! I can do more in Phys. Workshop (need advance warning.)

  3. Resistor Rules Electricity Lesson 8

  4. Learning Objectives To know and derive the rules for resistors in series and parallel.

  5. Recap What are the circuit rules for current and potential difference?

  6. Potential Difference Rule 1

  7. Resistors in Series The pd across all the components is equal to the sum of the pds across each component:- Using R=V/I, we can write:-

  8. Resistors in Series The resistance across all three resistors is:- Then cancelling the Is on the right hand side:-

  9. Quick Question (a) What is total resistance of the three resistors connected in series?

  10. Resistors in Parallel

  11. Resistors in Parallel The current splits at a junction but the potential difference is the same across both:- Using R=V/I we can say:-

  12. Resistors in Parallel So it follows that:- Dividing throughout by V gives:-

  13. Resistors in Parallel • What is the resistance across the two resistors if R1 = 10 Ω? • R2 = 5 Ω? • If it is a 1.5 V cell evaluate I, I1 and I2?

  14. Practice Calculation What is the resistance across the 4 ohm and 8 ohm resistors? What is the total resistance? What is the current in each part of the circuit?

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