How do you calculate current using Ohm's Law?

How do you calculate current using Ohm's Law?

• A. I = V × R
• B. I = V / R
• C. I = R / V
• D. I = V + R

Answer: (B)

Ohm's Law shows how voltage, current, and resistance relate. The current through a conductor is the voltage across it divided by its resistance, because V = I × R and solving for current gives I = V / R. This means current increases with higher voltage and decreases with higher resistance. Units line up: volts divided by ohms gives amperes. For example, with 12 volts across a 4‑ohm resistor, the current is 12 / 4 = 3 amperes. The other forms aren’t correct because they don’t reflect the direct V to I relationship: multiplying voltage by resistance, or dividing resistance by voltage, or adding voltage and resistance don’t yield current in general.

Ohm's Law shows how voltage, current, and resistance relate. The current through a conductor is the voltage across it divided by its resistance, because V = I × R and solving for current gives I = V / R. This means current increases with higher voltage and decreases with higher resistance. Units line up: volts divided by ohms gives amperes. For example, with 12 volts across a 4‑ohm resistor, the current is 12 / 4 = 3 amperes. The other forms aren’t correct because they don’t reflect the direct V to I relationship: multiplying voltage by resistance, or dividing resistance by voltage, or adding voltage and resistance don’t yield current in general.