Electrolysis Practice Exam

What unit measures the amount of resistance in a circuit?

1. Amperes

2. Ohms

3. Volts

4. Watts

The correct answer is: Ohms

The unit that measures the amount of resistance in a circuit is ohms. Resistance is a fundamental property of electrical components that opposes the flow of electric current. According to Ohm's Law, the relationship between voltage (measured in volts), current (measured in amperes), and resistance (measured in ohms) can be expressed as V = I × R, where V is voltage, I is current, and R is resistance. This means that for any given voltage, an increase in resistance will reduce the current flowing through the circuit. Ohms are named after Georg Simon Ohm, who formulated the basic principles of electricity, and they play a crucial role in understanding how electrical circuits function. The other units mentioned are related to different aspects of electricity: amperes measure current, volts measure electrical potential difference, and watts measure power, but none of these directly measure resistance. Understanding ohms and how they relate to other electrical measurements is essential for working with and analyzing electrical circuits.