Wednesday, May 11, 2011

4841 electrical Resistors

Resistors

Today we went covered resisters; they are mainly used of creating a resistance in a circuit when some components cannot handle the current of the supply voltage

readings

Band colours
Measured value
Low tolerance
High tolerance
Pass/fail
Red red
22 +-5%
21.8
20.7
22.9
pass
Ble gry yelw
684000+-5%
695000
660000
729000
pass
Org org bwn
330 +-5%
327
310
343
pass
Bwn rd
82 +-5%
81.1
77.0
85.1
pass
Grn blu bwn
560 +-5%
551
523
578
pass

Resistor1. 21.8ohms / resistor2. 695ohms

1 and 2 in series 699ohms

In series the resistance increases with each resistor added to the circuit so total resistance is all the resistors added up.

1 and 2 in parallel 21.8ohms

In parallel the total resistance should be lower than the smallest resistor, the more resistor you put in a circuit the less resistance becomes.

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