A resistor with color bands of red, red, red, and silver is placed across a 5-volt source. What is the expected range of current

Question

need answers soon 30 mins

 

Answer 1

The color code indicates digits for the resistor according to:

 

Black  -- 0

Brown -- 1

Red -- 2

Orange -- 3 

Yellow -- 4

Green -- 5

Blue -- 6

Violet  -- 7

Grey -- 8

White -- 9

Gold  -- 0.1

Silver -- 0.2

 

Most resistors are marked in a five-band structure, where the first three bands represent digits in the resistance, and the fourth is the power-of-ten multiplier, which raises the power of ten to whatever that color's digit is.  For example:

 

green(5)-blue(6)-grey(8)-brown(1)  = 568 x 10¹ or 5680 Ω (or 5.68 kΩ)

 

You can use this find the resistance (sometimes there is also a fifth band that signifies the uncertainty or tolerance in the resistor, as well, but you are only given four digits, which probably means they are leaving that fifth band out of this problem).

 

Once you figure out the resistance, just follow Michael's suggestion above about using V=IR.  Hope this can still help!

 

Answer 2

You will need to use ohm's law:

 

I = V / R

 

where:

I = current

V = voltage

R = resistance

 

 

The resistance is a color-coded value.  So you will have to use your reference guide that shows the resistance represented by each color.  Each color will represent a range of resistance.  Look for the color for your resistor and add the values up.  Find the total minimum value and total maximum value of the resistance.  Then apply it to ohm's law.