900 topic ideas – page 25 of 36.

Transfer the same amount of data or stream the same content over Wi-Fi and mobile data. Use paired measurements on the same device.

Compare battery loss at different screen refresh rates while keeping displayed content and brightness constant.

Run a fixed number of local AI inferences using models of different sizes. Compare energy per inference, runtime, and device temperature.

Measure input and output energy at different load currents. Determine the load at which efficiency is greatest.

Determine travel time between two microphones or by echo at several temperatures. Compare linear and square-root-type models.

Use waterproof transmitters and receivers in a container of constant length. Because of the more demanding measurement, this topic is especially suitable for an EE.

Measure the travel time of an acoustic or ultrasonic signal through solutions with different salt concentrations at constant temperature.

Vary humidity in a controlled experimental space without human exposure in a sealed environment, while simultaneously controlling temperature.

Measure resonant frequencies of open and one-end-closed tubes of different lengths. Investigate the relationship between frequency and inverse tube length.

Vary the air or water volume in identical bottles. Compare different geometric models for the resulting frequency.

Place materials of different types and thicknesses between a speaker and microphone. Model attenuation in decibels as a function of thickness and frequency.

Measure room reverberation time with different amounts of absorbing material. Compare measurements with an acoustic room model.

Measure magnetic-field strength along a fixed axis at increasing distances. Determine the exponent of a power model.

Rotate the sensor in fixed angular steps relative to the magnet. Test whether the measured field component follows a trigonometric model.

Compare stacked magnets and magnets separated by different gaps. Investigate field strength and spatial uniformity.

Place equal-thickness layers of plastic, aluminium, steel, or other materials between magnet and sensor. Investigate changes and redirection of the field.

Vary the current through a fixed coil within safe limits. Measure the magnetic field at the centre and at several external points.

Build coils of equal length with different numbers of turns. Keep current constant and investigate the relationship with field strength.

Move the same magnet through a coil at different speeds. Compare peak voltage and total voltage–time area.

Allow a magnet to swing past an aluminium or copper plate. Model oscillation decay time as a function of separation distance.

Measure signal strength along a straight line with clear line of sight. Fit a logarithmic distance model and examine residuals.

Compare wood, glass, plasterboard, brick, and concrete under similar geometry. Calculate additional loss relative to a clear line of sight.

Stack several identical panels or layers. Test whether loss in decibels increases approximately linearly with thickness.

Compare controlled wet and dry samples of the same material. Record mass, moisture level, and signal loss.

Rotate the smartphone through fixed angles or change a standardized hand position. Analyse the mean and variation of signal strength.