Question

A resistor's first three colour bands are red, yellow and black. What is its value?

1) 240 ohms
2) 24 ohms
3) 32 ohms
4) 420000 ohms

Answer 1

The resistor with color bands red, yellow, and black has a resistance of 24 ohms, which corresponds to the numerical codes of the color bands with red being 2, yellow 4, and black representing a multiplier of 1.

Step-by-step explanation:

The question relates to calculating the resistance value of a resistor based on its color bands. The first three color bands on a resistor indicate its resistance value, where the first two bands represent the two significant digits and the third band serves as the multiplier.

In the case of red, yellow, and black bands, red corresponds to the number 2, yellow to the number 4, and black represents a multiplier of 1 (or 100). Thus, the resistance value is 24 ohms (red: 2, yellow: 4, black multiplier: x1). Therefore, the correct option among the given choices is 2) 24 ohms.