In an electrical system, what unit measures the force or pressure causing the flow of electricity?

• A. Amperes
• B. Watts
• C. Volts
• D. Ohms

Answer: (C)

The unit that measures the force or pressure causing the flow of electricity is volts. In electrical terms, voltage represents the electric potential difference between two points in a circuit. It is often described as the "push" that moves electric charges through a conductor, similar to how water pressure pushes water through a pipe.

Understanding voltage is crucial in any electrical system because it directly influences how much current (measured in amperes) will flow through the circuit for a given resistance (measured in ohms). With higher voltage, more energy is available to drive the current, which exemplifies the relationship described by Ohm's Law, where voltage is equal to the product of current and resistance.

Other units mentioned, such as amperes, measure current (the flow of electric charge), watts measure power (the rate of energy transfer), and ohms measure resistance (the opposition to current flow). While these units are important in the study of electrical systems, they do not measure the force or pressure that enables current to flow. Therefore, volts is the correct choice for describing the driving force behind electric current.