Question

A resistor has a marking of 470 ohm ,10% . What will be true value of resistor

Answer 1

47kohm.

Explanation:

Resistor values are often written on circuit diagrams using a code system which avoids using a decimal point because it is easy to miss the small dot. Instead the letters R, K and M are used in place of the decimal point.

To read the code, replace the letter with a decimal point, then multiply the value by 1000 if the letter was K, or 1000000 if the letter was M. The letter R means multiply by 1.

A 470ohm resistor with 10V across it needs a power rating P = V²/R = 10²/470 = 0.21W.

In this case, a standard 0.25W resistor is suitable.

The resistor is marked with  47kohm.