Answer:
5.Application of Parallel circuits:

1. Lighting in your house: if any of them is burnt, you still get the others on.
2. Voltage regulation in a DC rectifying circuit. You add a huge capacitor in parallel with an inverse polarized zenner diode and some other things.

Applicatuon of Series circuits:

1. Lighting in your house: the light switch is in series with any amount of parallel lamps you want to turn on and off at the same time.
2. When, within a circuit, you have a power indicator LED, you will put it in series with a resistor to make sure the current through the LED is correct.

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