ARRL Technician Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the ARRL Technician Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the basic unit of electromotive force?

Watt
Volt
Ohm
Ampere

The correct answer is: Volt

The basic unit of electromotive force is the volt. Electromotive force (EMF) refers to the energy provided per charge by a power source, such as a battery or generator, and is measured in volts. One volt is defined as the potential difference required to move one coulomb of charge with one joule of energy. This measurement is vital in understanding how electrical circuits operate, as EMF dictates how much energy is available to push electric charges through the circuit. Recognizing that the other options relate to different electrical concepts clarifies why volt is the appropriate choice. The watt is a unit of power, the ohm is a measure of resistance, and the ampere measures current. Each of these units plays a role in the broader context of electrical principles, but none represents electromotive force.