CH.06
Ohm's Law — Field Calculator
← FIELD MANUAL
Ohm's Law — Field Survival Tool
Ohm's Law Calculator
V = I × R
V ┌─────┐ │ I │ R └─────┘
// Cover what you want to find
Voltage (V) — Volts
Current (I) — Amps
Resistance (R) — Ohms
CALCULATE
CLEAR
// Real World Scenarios — Tap to Load
4–20mA Loop
24VDC Control
110VAC Motor
Thermocouple
⚡ Troubleshooting Context
// Field Notes
4–20mA loops:
Standard = 250Ω load, 24VDC supply (1V to 5V drop)
Voltage drop:
Problem child in long cable runs — check every junction
High resistance:
Usually corrosion, loose terminal screws, oxidized contacts
Low resistance:
Short circuit, damaged insulation, moisture intrusion
Power = V × I:
Always calculate — heat kills electronics slowly