EXPERIMENT1

Resistors

Resistors reduce and limits the current. A thin film of carbon is deposited onto a small ceramic rod. Resistor is covered with an insulating coating and painted with colour bands to indicate the resistor value.


Identifying, Testing and Combining Resistors




• First two or three bandsmay be the numbers towrite down

• Next band is the multiplier(how many zeros to add tothe number)

• Gold multiplier makes onedecimal place smaller,Silver makes two decimalplaces smaller

• Last band to right may betolerance values

• Notice the examples on theright

• Brown, red, red = 1, 2, 100,5% = 1200 5%, or1.2K ,1K2




Obtain 6 resistors of different values.

Recorded values in the chart:
(Colour Codes)　(Multimeter)
2200 ± 5% Ω　　 2.16kΩ 　(Red, Red, Red, Gold) 2090~2310Ω
47000 ± 5% Ω　　46.1k Ω 　(Yellow, Violet, Orange, Gold) 44650~49350Ω
100 ± 5% Ω　　　99.6k Ω 　(Brown, Red, Gold) 95~105Ω
22000 ± 5% Ω　　221k Ω 　(Red, Red, Yellow, Gold) 20900~23100Ω
10000 ± 5% Ω　　9.82k Ω　 (Brown, Black, Orange, Gold) 9500~11500Ω
27000 ± 5% Ω　　270k Ω 　(Red, Violet, Gold) 25650~28350Ω

Two resistors ohm resistance value measured with a multi-meter.

Resistor 1 : 2.16k Ω
Resistor 2 : 46.1k Ω

Two resistors calculated and mesured value, put together in series.

a)Calculated value 1 and 2 in series: 49200 Ω
　Measured value 1 and 2 in series: 48.2k Ω

b)Calculated vlaue 1 and 2 in parallel: 2.10k Ω 　
　Measured vlaue 1 and 2 in parallel: 2.07k Ω

Measured using:
R1 x R2　2.2k x 47k
--------- = --------------- = 2.1k
R1 + R2　2.2k + 47k