1. Additional Physics – Forces L/O :- To be able to work out current and charge in an electrical circuit “Current and charge” Exam Date -

2. Quick quiz What is the equation for work done? What affects your momentum? How do you work out speed? What 2 equations can you use to work out acceleration? What is acceleration measured in? What is the equation for work done and what is it measured in? What is Hooke’s law? What is terminal velocity and what are the forces like on an object which has reached this? Name 3 things which can affect thinking distance

3. Can you remember what these symbols mean? Heater Fuse Motor Transformer LED (light emitting diode) Diode Lamp Generator

4. TASK How does adding bulbs affect the charge in a circuit? INFO Current in the flow of electric charge. The size of the current is the rate of flow of electric charge. I = Q ÷ T Current = Charge ÷ Time (Amps A) (Coulombs C) (s)

5. How does adding bulbs affect the charge in a circuit? Hypothesis Prediction Independent variable = Dependent variable = Control variables Repeatability

6. How could you check the accuracy of your charge calculations?

7. Lighting Type Efficacy (watt) Lifetime (hours) Color Rendition Index (CRI) Color Temperature(K) Indoors/ Outdoors Incandescent Standard "A" bulb10–17750–250098–100 (excellent) 2700–2800 (warm) Indoors/ outdoors Energy-Saving Incandescent (or Halogen) 12–221,000–4,00098–100 (excellent) 2900–3200 (warm to neutral) Indoors/ outdoors Fluorescent Straight tube30–1107000–24,00050–90 (fair to good) 2700–6500 (warm to cold) Indoors/ outdoors Compact fluorescent lamp (CFL) 50–7010,00065–88 (good) 2700–6500 (warm to cold) Indoors/ outdoors High-Intensity Discharge Mercury vapor25–6016,000–24,00050 (poor to fair) 3200–7000 (warm to cold) Outdoors Metal halide70–1155000–20,00070 (fair)3700 (cold) Indoors/ outdoors Light-Emitting Diodes Cool White LEDs60–9225,000–50,00070–90 (fair to good)5000 (cold) Indoors/ outdoors Warm White LEDs27–5425,000–50,00070–90 (fair to good)3300 (neutral) Indoors/ outdoors

8. What have you learnt? Do you know the electrical symbols? Can you explain what current is? Do you know an equation you can use to work out current?