Electrical Components


Over the past 3 weeks I have been doing work on electrical components this is what I have learned.

Cathode on left Anode on right

Diodes: When we went over diodes I found that they are used to Prevent current going in the wrong direction in a circuit. this is called reverse bias the arrow in the symbol shows which way the current is being stopped from flowing each end is differentiated by one being a cathode and the other a Anode  
I also found when I tested one with a Multimeter that it only gets a reading when its tested from anode to cathode meaning current is only flowing in one direction.






Resistors: The main thing I learned from resistors Is how to get what there rating is from the coloured bands on the resistor. the first 2 bands are the starting numbers and then the following band is how many zeros are added to the earlier numbers and then you get the reading in Ohms eg. 

This resistor is 2000 Ω Because the first red band means the number 2, the black band means the number 0 and the last red band is the number of zeros to add on which being red means 2 so 2 zeros are added getting the value.

I also tested two resistors in series and parallel circuits by combining them together and found when they are in series one after the other the total resistance is added together and when in parallel the voltage is split evenly between both resistors. The same as circuit using light bulbs.