The relationship between voltage, current, and resistance is expressed by which law?

• A. Newton Law
• B. Boyle’s Law
• C. Ohm Law
• D. Hooke’s Law

Answer: (C)

Voltage, current, and resistance are linked by Ohm's Law. It states that the current flowing through a conductor equals the voltage divided by the resistance, and equivalently, voltage equals current times resistance. In symbols, I = V/R and V = IR. So, increasing voltage while resistance stays the same raises the current proportionally; increasing resistance with the same voltage lowers the current; and for a target current, you can adjust either voltage or resistance accordingly. This relationship is especially important in clinical electrolysis, where skin and tissue resistance can vary widely; understanding how voltage and resistance influence current helps explain why device settings must be carefully controlled to deliver safe, effective currents. The other options refer to laws in different domains (motion, gases, springs) and do not describe electrical relationships.