V = IR in a Real Factory: Ohm's Law Beyond the Textbook | Textbook to Workshop #Shorts

Textbook to Workshop · 01: Ohm's law

V = IR. You learnt it in Class 10. Factories run on it.

• Textbook: 12 V across 6 Ω gives 2 A. Double the resistance, half the current
• Factory: a pressure sensor sends its reading as a current, 4 to 20 mA
• At the controller (PLC), a 250 Ω resistor turns it into voltage: 4 mA × 250 Ω = 1 V (empty), 20 mA × 250 Ω = 5 V (full scale)
• Why start at 4 mA, not zero? If the wire breaks, current falls to 0 mA. The PLC knows it's a fault, not an empty pipe

Can you solve it? The sensor sends 12 mA through the same 250 Ω resistor. What voltage does the PLC read, and how full is the scale? Answer in the comments.

This is everyday work in ISTC's electronics courses, after Class 10, AICTE approved:
• Diploma in Electronics Engineering, 3 years
• Advanced Diploma in Mechatronics & Industrial Automation, 4 years
https://istckonnect.com/admissions

MAKE THE TEXTBOOK WORK.

For ISTCians. By ISTCians. Since 1963.

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