5 unite eksik kisim - bmjjf yur 76, Lecture notes of Materials Physics

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This can be made from discrete components but more usually consists of four diodes contained in one package. It is mounted on an’ 20 aluminium heatsink to keep the diodes from overheating. The third stage is a smoothing circuit. It removes the fluctuations‘in the DC output of the rectifier. It consists of a large electrolytic capacitor connected in parallel with the rectifier as shown in Fig. 4. 2 Fig. 4 The final stage is a stabilizing circuit consisting of a transistor biased 25 by two resistors and a zener diode. This prevents the output from changing when the load varies. NiCad batteries have such a small internal resistance that the charger must produce a constant current output (see Fig. 5). constant | current output smoothed fe pc b input J Fig. 5 Task 10 Match each component or unit with its function in a battery charger. For example: The transformer steps down the AC mains voltage. Component/Unit Function in a battery charger | 1 transformer a__ steps down the AC mains voltage \q 2 double-pole switch b prevents the output from 3 neon lamp changing when the load varies 4 fuse c_ keeps the diodes from overheating 5 rectifier d__ shows when the charger is on 6 aluminium heatsink e removes the fluctuations in the 7 smoothing circuit DC output of the rectifier 8. stabilizing circuit f protects the transformer 8 converts the AC voltage to a DC voltage h switches the charger on and off ih 31