experiment no.2 ( diodes )

Diodes are symbolised by a white ring on the diode, closet to the cathode end indicating the negative end of the diode.

When the cathode end of the diode is connected to the earth of the power supply the diode is in forward bias
Reverse bias is when the diode is conected back to front

calculate the value of current flowing through the diode:

calculated : i=v/r = 5.02-0.7/1000 = 0.00432 = 4.32 ma

measured : 4.35 ma

To find the amount of current flowing through the diode, i

used the formula i = v/r , dividing the voltage by the resistance giving me the current .

calculate the voltage drop across the diode :

calculated : v= i x r =

measured : 0.65 v

maxium value of current flow through the diode:

Ta=1.0@75degreesceluis

maxium value of supply voltage (Vs) at which the diode is safe to run:

v=ixr= 1x1000 = 1000@75degreesceluis

Diode is replaced by LED :

calculated: 5.02 -1.8/1000 = 3.22/1000 = 0.00322 ma

measured: 3.3 ma

NOTE: LED circuit uses more volts but less amperage than the diode.