# DC Circuits Week 7

#### This material given in advance for you to prepare for the following weeks lesson.  We have less time in the classroom for this learning, so it is important that you do the study at home. When you come to class you should know this material in advance.  I have supplied a powerpoint to guide you through what you need to learn.  There are powerpoint slides on the topics and some reading as well.  Keep checking back as I am updating this daily.

 LINKS TO POWERPOINTS etc LOCKED – PASSWORD NEEDED Wheatstone Bridge by Greg Moore Wheatstone Bridge by Greg Moore Capacitors Participatory ppt, TAFE Topic 15 Capacitors PPT 1 Capacitors series parallel Participatory ppt, TAFE Topic 16 Capacitors PPT 2 More powerpoints coming soon, stay tuned! Cook text section on caps Text Material Capacitors for time constants

There is so so much stuff to know about capacitors.

But basically if you can know about charge on a capacitor, and charging current, discharging current…. charging voltage and discharging voltage and some safety considerations like voltage ratings, and some WHS awareness – because capacitors can be lethal, .. well that is maybe enough for our study.  So, it’s some maths, some type differences, some safety, some usage in circuits, and we are home and hosed.

here is a video of rapidly charging a 1F capacitor, which discharges very slowly into a LED.  Charging a 1F capacitor will put a lot of pressure on a conventional power supply and may cause it to blow a fuse.  There should be some resistance in series with the capacitor to limit the charging current at surge.

# Here is the video lab:

#### Really nicely built circuit above compared to the circuit below.  Must get the colours right in the video next time too!  Gotta get that yellow out!

Then on the other hand, my video took 2 hours to design and produce.  I think this other video needed maybe 25 hours. 🙂

#### Material on capacitor time constants concludes.

Ye olde stuffy beneathy … from previous teachings etc.

### MAP

• February 23, 2019
• November 24, 2018
• November 24, 2018
• August 6, 2018
• May 26, 2018
{"speed":500,"height":400,"pause":2000}
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