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Electricity Part 1 (Equations (Current(A) = change in charge(C) / change…
Electricity Part 1
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Notes
Electrons flow from negative to positive, conventional current is from positive to negative, the opposite. Arrows on a circuit indicate conventional current.
Current will only flow round a complete circuit.
Current will follow the path of least resistance, if a bulb is in parallel with a wire, the bulb won't light it is short circuited
An ohmic resistor on an I-V graph will be a straight line through the origin.
A filament lamp follows the general curve of x = y^3 as heat increases and becomes a factor in resistance
Diodes
When the diode is forward biased: there is a high resistance until the turn on voltage at around 0.6V
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When the diode is reversed biased it has a very high resistance until the breakdown voltage when a large current flows. This is at between 50 and 500V
Usually a resistor is placed in series with a diode to protect it so the diode doesn't have too much current flowing through it
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Relations
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Ohms law-
The P.D. across the component is directly proportional to the current through it as long as the external conditions remain constant.
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