1. Joule Heating (Electric Heaters, Incandescent Bulbs): P = $I^{2}$R. Heater coils use nichrome (high ρ, high melting point) to generate heat. Tungsten filament bulbs glow because of high Joule heating at operating temperature.

2. Fuses and Circuit Breakers: Fuse wire has low melting point. When I exceeds rated value, $I^{2}$R heating melts it, breaking the circuit and protecting appliances. Fuse rating = maximum safe current.

3. Resistance Thermometers (RTDs): R = $R_{0}$(1 + α$\Delta T$) is used for precision temperature measurement. Platinum RTDs (PT-100, PT-1000) are used in industry because platinum has a very stable, linear α.

4. Potentiometer in Automotive Systems: Fuel level gauges, volume knobs, and throttle position sensors use potentiometer principles — variable division of a reference voltage.

5. Wheatstone Bridge in Strain Gauges: Strain gauges use a Wheatstone bridge configuration to measure tiny resistance changes due to mechanical strain. Used in load cells, pressure sensors, and accelerometers.

6. Household Parallel Wiring: All household devices are in parallel so each gets 220 V (or 110 V in the US), operates independently, and can be individually switched on/off.

7. Battery Internal Resistance in Practice: Old batteries have higher internal resistance → lower terminal voltage under load → dim lights. Measuring internal resistance via potentiometer tells battery health.

8. Semiconductors in Temperature Sensors (NTC Thermistors): NTC (Negative Temperature Coefficient) thermistors use the property that semiconductor resistance decreases with temperature. Used in digital thermometers, fan speed controllers, and medical devices.