Additional Physics – Forces L/O :- To be able to work out current and charge in an electrical...
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Additional Physics – Forces L/O :- To be able to work out current and charge in an electrical circuit “Current and charge” Exam Date -
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Transcript of Additional Physics – Forces L/O :- To be able to work out current and charge in an electrical...
Additional Physics – Forces
L/O :- To be able to work out current and charge in an electrical circuit
“Current and charge”
Exam Date -
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
Can you remember what these symbols mean?
Heater FuseMotor Transformer LED (light emitting diode) Diode Lamp Generator
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)
How does adding bulbs affect the charge in a circuit?
Hypothesis
Prediction
Independent variable =
Dependent variable =
Control variables
Repeatability
How could you check the accuracy of your charge calculations?
Lighting Type Efficacy (watt)
Lifetime(hours)
Color Rendition Index (CRI)
Color Temperature(K)
Indoors/Outdoors
Incandescent
Standard "A" bulb 10–17 750–2500 98–100 (excellent) 2700–2800 (warm)
Indoors/outdoors
Energy-Saving Incandescent (or Halogen)
12–22 1,000–4,000 98–100 (excellent) 2900–3200 (warm to neutral)
Indoors/outdoors
Fluorescent
Straight tube 30–110 7000–24,000 50–90 (fair to good) 2700–6500 (warm to cold)
Indoors/outdoors
Compact fluorescent lamp (CFL)
50–70 10,000 65–88 (good) 2700–6500 (warm to cold)
Indoors/outdoors
High-Intensity Discharge
Mercury vapor 25–60 16,000–24,000 50 (poor to fair) 3200–7000 (warm to cold) Outdoors
Metal halide 70–115 5000–20,000 70 (fair) 3700 (cold) Indoors/outdoors
Light-Emitting Diodes
Cool White LEDs 60–92 25,000–50,000 70–90 (fair to good) 5000 (cold) Indoors/outdoors
Warm White LEDs 27–54 25,000–50,000 70–90 (fair to good) 3300 (neutral) Indoors/outdoors
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?
