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Week 10 — Group assignment: Power measurement

Group documentation focus: power measurement of output devices.

Individual assignment

Your personal work for this week — notes, photos, design files, and reflections.

Group assignment

Guangzhou (Chaihuo) — group documentation: measuring the power consumption of output devices.

Week 10 assignment:

  1. Group assignment: measure the power consumption of an output device.
  2. Individual assignment: add an output device to your own board and program it.

Objective

We measured the power behavior of a simple output load with a bench supply and multimeter, and documented a repeatable method that can be reused in individual projects.

Instruments and setup

  • Bench DC supply (CV mode)
  • Digital multimeter
  • Output load fixture
  • Alligator clips and test leads
Week 10 bench setup overview
Figure 1. Full bench setup with supply, meter, and test fixture.
Week 10 wiring close-up
Figure 2. Close-up of the wiring and fixture connection.

Calculation method

Power is calculated with:

P (W) = V (V) × I (A)

Current can be cross-checked with Ohm's law when resistor voltage is measured:

I = V / R

Experiment 1 — Device ON state

We energized the load and recorded voltage/current from the bench supply and multimeter after readings stabilized.

Week 10 team operation
Figure 3. Team operation during ON-state measurement.
Meter reading example 1
Figure 4. Meter/supply readings under load.
Meter reading example 2
Figure 5. Additional ON-state reading snapshot.

Experiment 2 — Open-circuit baseline

We disconnected/opened the loop to verify near-zero baseline current and confirm wiring behavior.

Zero current baseline example
Figure 6. Open-circuit baseline (current near zero).

Experiment 3 — Dynamic / repeated operation

We repeated operation and observed current/power changes across multiple states to verify consistency.

Team operation close view
Figure 7. Repeated operation test and observation.
Meter reading example 3
Figure 8. Dynamic-state reading snapshot.
Load working state test
Figure 9. Output working-state verification under power.

Summary table

Condition Observation Conclusion
Load ON Current and power rise from baseline Output device consumes measurable power under operation
Open circuit Current near zero Baseline behavior is validated
Repeated/dynamic test Readings change with operating state Method is stable and reusable for future tests

Result summary

  • The workflow successfully captured state-dependent current and power changes.
  • Open-circuit baseline and loaded conditions were both observed.
  • The documented setup is suitable as a reusable template for Week 10 individual work.