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Transcript
..require engineering approach: Abstraction
• We do not care about
– Length of the wire in the light bulb
– Light bulb filament
– The temperature of the light bulb, etc.
• We replace physical item with a discrete element as if the physical
property (resistance of the light bulb, R, battery voltage V) is
concentrated in a single point and we can access it across its
terminals (A and B in the Fig below).
• Now we observe only the key issue: the power delivered to the load.
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