Question

A close inspection of an electric circuit reveals that a 480-Ω resistor was inadvertently soldered in the place where a 340-Ω resistor is needed. What is the difference in resistance between the required and the actual resistor?

1) 140 Ω
2) 180 Ω
3) 220 Ω
4) 260 Ω

Answer 1

The difference in resistance between the required 340-Ω resistor and the actual 480-Ω resistor is 140 Ω, calculated by subtracting the resistance values.

Step-by-step explanation:

The question addresses a common problem in electric circuits involving the incorrect placing of a resistor with a different resistance value than required. Since resistance is normally measured in ohms (Ω), the difference between the required and actual resistor can be calculated by simply subtracting the value of the required resistor from the actual resistor. In this case, the difference between the required 340-Ω resistor and the inadvertently placed 480-Ω resistor is 140 Ω.

To calculate this difference, you take the larger resistance value and subtract the smaller one:

480 Ω (actual) - 340 Ω (required) = 140 Ω

This means that the actual resistor has 140 Ω more resistance than the required resistor. Therefore, the correct answer is 1) 140 Ω.