Which law relates current, voltage, and resistance?

Which law relates current, voltage, and resistance?

• A. Faraday's law
• B. Ohm's law
• C. Newton's law
• D. Joule's law

Answer: (B)

The relationship among current, voltage, and resistance is described by Ohm's law. It states that current equals voltage divided by resistance (I = V/R). This means for a given resistance, increasing the voltage pushes more current; for a given voltage, increasing resistance reduces the current. In practical terms, a resistor or any ohmic conductor follows this linear relationship at constant temperature. So if you double the voltage with the same resistor, the current roughly doubles; if you double the resistance with the same voltage, the current halves. While Joule's law connects power to current and resistance (P = I^2R) and Faraday's law deals with induced voltages from changing magnetic fields, the direct link among current, voltage, and resistance is the one captured by Ohm's law.

The relationship among current, voltage, and resistance is described by Ohm's law. It states that current equals voltage divided by resistance (I = V/R). This means for a given resistance, increasing the voltage pushes more current; for a given voltage, increasing resistance reduces the current. In practical terms, a resistor or any ohmic conductor follows this linear relationship at constant temperature. So if you double the voltage with the same resistor, the current roughly doubles; if you double the resistance with the same voltage, the current halves. While Joule's law connects power to current and resistance (P = I^2R) and Faraday's law deals with induced voltages from changing magnetic fields, the direct link among current, voltage, and resistance is the one captured by Ohm's law.