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Electronics, Medical use of radiation, Reflection, Refraction - Coggle…
Electronics
Electrical hazards
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Damaged Insulation – If someone touches an exposed piece of wire, they could be subjected to a lethal shock
Overheating of cables – Passing too much current through too small a wire can lead to the wire overheating. This could cause a fire or melt the insulations, exposing live wires
Damp conditions – If moisture comes into contact with live wires, the moisture could conduct electricity either causing a short circuit within a device (which could cause a fire) or posing an electrocution risk
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The transformer alters voltage in AC circuits, vital for stepping up/down voltage in power distribution.
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Resistors control current flow, crucial for limiting current and dividing voltage in circuits.
Thermistors alter resistance with temperature change, (As temperature increases, resistance decreases allowing current to pass through. key in temperature-sensing circuits and thermostats.
Medical use of radiation
Radiation therapy targets cancer cells, shrinking tumors and preventing their spread.
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X-rays help diagnose broken bones and detect internal injuries swiftly and accurately by penetrating through skin but not bones allowing the doctor to see through the patient's body without surgery.
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Reflection, Refraction
Reflection
An incident ray has an arrow pointing towards the boundary
A reflected ray has an arrow pointing away from the boundary
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Refraction
An incident ray has an arrow pointing towards the boundary
A refracted ray has an arrow pointing away from the boundary
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The only properties that change during refraction are speed and wavelength – the frequency of waves does not change
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Lens diagrams
Key terms:
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The principal focus, or focal point, is defined as: The point at which rays of light travelling parallel to the principal axis intersect the principal axis and converge or the point at which diverging rays appear to proceed
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Converging lenses can be used to correct long-sighted vision
Diverging lenses can be used to correct short-sighted vision
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