Which law relates voltage, current, and resistance in an electrical circuit?

Which law relates voltage, current, and resistance in an electrical circuit?

• A. Ohm's Law
• B. Coulomb's Law
• C. Faraday's Law
• D. Kirchhoff's Law

Answer: (A)

Understanding how voltage, current, and resistance relate is essential for analyzing circuits. Ohm's Law describes this relationship: voltage equals current times resistance (V = I × R). It shows that the current flowing through a conductor depends on how much voltage drives it and how much the conductor resists the flow. Because it ties all three quantities together, you can determine any one if you know the other two. For example, doubling the voltage while leaving resistance the same doubles the current; increasing resistance with constant voltage cuts the current in proportion. In aircraft electrical systems, this proportional relationship helps engineers size wires, fuses, and components so they carry the correct current without overheating. The other laws mentioned—Coulomb's Law (forces between charges), Faraday's Law (emf induced by changing magnetic flux), and Kirchhoff's Laws (conservation of current and energy around circuits)—describe related electrical phenomena, but they do not directly express the simple V, I, R relationship for a linear resistor.

Understanding how voltage, current, and resistance relate is essential for analyzing circuits. Ohm's Law describes this relationship: voltage equals current times resistance (V = I × R). It shows that the current flowing through a conductor depends on how much voltage drives it and how much the conductor resists the flow. Because it ties all three quantities together, you can determine any one if you know the other two. For example, doubling the voltage while leaving resistance the same doubles the current; increasing resistance with constant voltage cuts the current in proportion.

In aircraft electrical systems, this proportional relationship helps engineers size wires, fuses, and components so they carry the correct current without overheating. The other laws mentioned—Coulomb's Law (forces between charges), Faraday's Law (emf induced by changing magnetic flux), and Kirchhoff's Laws (conservation of current and energy around circuits)—describe related electrical phenomena, but they do not directly express the simple V, I, R relationship for a linear resistor.