Current Electricity 5 Question 4

4. A 2W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is

(2019 Main, 10 Jan I)

(a) 0.4mA

(b) 63mA

(c) 20mA

(d) 100mA

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Solution:

  1. Colour code of carbon resistance is shown in the figure below

So, resistance value of resistor using colour code is

R=502×10=50.2×102Ω

Here, we must know that for given carbon resistor first three colours give value of resistance and fourth colour gives multiplier value.

Now using power, P=i2R

 we get, i=PR=250.2×10220×103A=20mA.



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