By Ohm's law, V = ?

**The reasoning** Ohm's Law states that **voltage is directly proportional to current and resistance**. Think of it like water flowing through a pipe: the pressure (voltage) needed depends on how much water flows (current) and how narrow the pipe is (resistance). The formula is: **V = IR** Where: - V = Voltage (in Volts) - I = Current (in Amperes) - R = Resistance (in Ohms) So if current is 2A and resistance is 5Ω, then V = 2 × 5 = 10V. **Why the wrong options tempt you** - **A) I/R** — This is what you'd get if you incorrectly rearranged V = IR. It would give you current squared per resistance, which has no physical meaning. - **C) I²R** — This is the formula for **electrical power loss** (heat dissipated), not voltage! It's easy to mix up because it also uses I and R. - **D) R/I** — Just resistance divided by current. Makes no sense physically and gives wrong units. **Quick takeaway** Remember: "**V**ery **I**mportant **R**ule" — V = IR. Voltage equals current times resistance, always!