Nate Electrical Practice Exam

Doubling the voltage to a fixed resistance will:

1. Not change the current

2. Cause the current to double

3. Cause the current to triple

4. Cause the current to increase by a factor of four

The correct answer is: Cause the current to double

Doubling the voltage applied to a fixed resistance will indeed cause the current to double, which aligns with Ohm's Law. Ohm's Law states that Voltage (V) is equal to the product of Current (I) and Resistance (R), expressed mathematically as V = I × R. If the resistance remains constant and the voltage is doubled, you can rearrange the formula to find the new current: When the initial condition is V₁ = I₁ × R, if you double the voltage to V₂ = 2V₁, then substituting this back into the equation gives us: 2V₁ = I₂ × R. By dividing both sides of the equation by R, you can see how the current changes: I₂ = (2V₁) / R = 2(I₁). This shows that the current I₂ is indeed double the original current I₁ when the voltage is doubled. This principle is fundamental to understanding electrical circuits and is rooted in the relationship defined by Ohm's Law, which is critical for electrical practitioners to grasp in real-world applications.