A resistor with color bands of blue, gray, and black indicates what value?

To determine the value indicated by the color bands of a resistor, you can refer to the color code for resistors. In this case, the bands are blue, gray, and black. Each color corresponds to a digit as follows:

• Blue represents the digit 6.

• Gray represents the digit 8.

• Black, as a multiplier, represents 1 (10^0).

The value of the resistor is calculated by taking the first two digits from the first two color bands and then multiplying by the value from the third band. Therefore, you combine the digits from blue (6) and gray (8) to form the number 68. Since the last band is black, you do not perform additional multiplication (as the multiplier is 1).

Thus, the value of the resistor is 68 ohms. The percentage tolerance associated with this resistor value is typically indicated by the fourth color band; however, that detail is not specified in the question. Among the provided options, 68 ohms with a 20% tolerance matches the result derived from the color codes accurately.