CANCOPPAS.COM

CBAUTOMATION.COM

CGIS.CA

CONVALPSI.COM

DAVISCONTROLS.COM

EVERESTAUTOMATION.COM

FRANKLINEMPIRE.COM

HCS1.COM

MAC-WELD.COM

SWAGELOK.COM

THERMO-KINETICS.COM

THERMON.COM

VANKO.NET

VERONICS.COM

WAJAX.COM

WESTECH-IND.COM

WIKA.CA

## AutoQuiz: How to Measure the Resistance in a Circuit

The post AutoQuiz: How to Measure the Resistance in a Circuit first appeared on the ISA Interchange blog site.

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

This automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for more information about the CCST program.

### A circuit has a 100 Ω resistor, a 50 Ω resistor, and a 200 Ω resistor all in parallel with each other. What is the total resistance of the circuit?

a) 28.6 Ω
b) 35.0 Ω
c) 175 Ω
d) 0.28 M Ω
e) none of the above

The correct answer is A, 28.6 Ω. To find the total resistance for resistors in parallel, use the equation:

Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, 2nd Edition