# ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

This blog covers numerous topics on industrial automation such as operations & management, continuous & batch processing, connectivity, manufacturing & machine control, and Industry 4.0.

The material and information contained on this website is for general information purposes only. ISA blog posts may be authored by ISA staff and guest authors from the automation community. Views and opinions expressed by a guest author are solely their own, and do not necessarily represent those of ISA. Posts made by guest authors have been subject to peer review.

# AutoQuiz: How Do You Calculate Capacitance?

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AutoQuiz is edited by Joel Don, ISA's social media community manager.

This automation industry quiz question comes from ISA's technical training course, Electrical Controls for the Control Systems Technician (TI23). This class focuses on electrical controls that are frequently overlooked in a formal training program. It is geared toward any level technician who wants a thorough review of electrical process concepts to reinforce their knowledge of basic electricity and develop skills required to install and maintain electrical control devices.

### What is the total capacitance of the circuit in the post image?

a) 1.67 pF
b) 16.7 µf
c) 15.0 pf
d) 15.0 µf
e) none of the above

Here's the answer to this quiz question from ISA's course offering, Electrical Controls for the Control Systems Technician (TI23).

Capacitance is defined as the ability of a dielectric to store electrical charge. The calculation of capacitance is reciprocally related to the calculation of resistance. Capacitance in parallel is calculated as the sum of the individual values and in series it uses the reciprocal method.

The correct answer is C.