A Resistor Is Connected Across A 50 V Source

Answer: C. 217.4 A

A resistor is connected across a 50 V source, the current in the resistor if the colour code is red, orange and silver is 217.4 A.

Solution:

The resistor colour coding scheme prints coloured bands on the body of the resistor to indicate the value of its resistance.

In this scheme, each colour band position and colour will have a significant value.

Resistor colour coding and their values are shown in below figure,

Colour	Digit	Multiplier	Tolerance
Black	0	1
Brown	1	101	1%
Red	2	102	2%
Orange	3	103
Yellow	4	104
Green	5	105	0.5%
Blue	6	106	0.25%
Violet	7	107	0.1%
Grey	8	108	0.05%
White	9	109
Gold		10-1	5%
Silver		10-2	10%
None			20%

Given,

Resistor colour code = red, orange, silver

Resistance of resistor = red→(2), orange→(3), silver→(×10^-2)

Resistance =23×10^-2=0.23Ω

So, 50 V source is connected across a resistor of resistance 0.23Ω,

So, current through resistor I=50 Volts/R

I=50 Volts/0.23Ω =217.4 A

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