Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads "red," "violet" and "yellow"?

In the standard resistor colour code system, the first two bands represent the first two significant digits of the value. Red represents the number 2, and violet represents the number 7, giving us a base significant value of 27. The third band acts as the multiplier, indicating how many zeros to append to the base value. Yellow represents 4, meaning we must add four zeros to 27, resulting in 270,000 ohms. Since one kilohm (kΩ) equals 1,000 ohms, you divide 270,000 by 1,000 to convert to kilohms. This gives the final correct value of 270 kilohms.