Question

According to Ohm’s law: ____.

• A. \( V \propto I \)
• B. \( V \propto 1/I \)
• C. \( R \propto I \)
• D. \( P \propto V \)

Hint:

To easily remember the relationships, use the "Ohm's Law Triangle" with $V$ on top and $I$ and $R$ on the bottom. To find any one value, cover it with your finger and look at the remaining two!

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Ohm’s law describes the relationship between voltage, current, and resistance in an ideal conductor. It states that the current through a conductor between two points is directly proportional to the voltage across the two points, provided physical conditions (like temperature) remain constant.

Step 2: Detailed Explanation:
Mathematically, the law is expressed as: \[ V \propto I \] To turn this proportionality into an equation, we introduce the constant of proportionality, $R$ (Resistance): \[ V = IR \] This indicates that if you increase the voltage ($V$) across a fixed resistor, the current ($I$) flowing through it will increase linearly.

Step 3: Final Answer:
According to Ohm's law, $V \propto I$.