Question

question 7 of 10 which of the following actions will always increase voltage? a. increasing resistance and keeping current constant b. decreasing resistance and increasing current c. increasing resistance and decreasing current d. decreasing resistance and keeping current constant

Explanation:

Step1: Recall Ohm's Law

Ohm's Law is $V = IR$, where $V$ is voltage, $I$ is current and $R$ is resistance.

Step2: Analyze Option A

If $I$ is constant and $R$ is increased, from $V = IR$, $V$ will increase since $V$ is directly proportional to $R$ when $I$ is fixed.

Step3: Analyze Option B

From $V = IR$, if $R$ decreases and $I$ increases, the change in $V$ is not always an increase. For example, if $R$ is halved and $I$ is doubled, $V$ remains the same.

Step4: Analyze Option C

From $V = IR$, if $R$ increases and $I$ decreases, the change in $V$ is uncertain. It depends on the magnitudes of the changes in $R$ and $I$.

Step5: Analyze Option D

From $V = IR$, if $I$ is constant and $R$ is decreased, $V$ will decrease as $V$ is directly proportional to $R$ when $I$ is fixed.

Answer:

A. Increasing resistance and keeping current constant