A Resistor Is Connected Across A 50 V Source

By Aina Parasher|Updated : July 13th, 2022

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

  1. 2 mA
  2. 2.2 mA
  3. 217.4 A
  4. 21.4 mA

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 

1

 

Brown 

101

1% 

Red 

102

2% 

Orange 

103

 

Yellow 

104

 

Green 

105

0.5% 

Blue 

106

0.25% 

Violet 

107

0.1% 

Grey 

108

0.05% 

White 

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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