Cooking and food
What creates pressure in an espresso machine?
Pressure through the coffee bed
Everyday electrical.
Follow energy and signals through the electrical things we use every day.
Air and temperature
Why can a heat pump deliver more heat than it uses?
Moving heat into a house
Air and temperature
Where does the heat from a fridge go?
Where a fridge puts the heat
Laundry and cleaning
How does a spinning drum remove water from clothes?
A balanced spin cycle
Laundry and cleaning
Why does the spray arm rotate without its own motor?
The arm driven by its jets
Light and illumination
Why does charging take longer than a flash?
A capacitor flash
Supply and protection
Why can a divider voltage fall when a load is connected?
A loaded voltage divider
Supply and protection
How do four diodes keep AC output flowing one way?
Four diodes, one direction
Supply and protection
Where does a battery’s energy go?
Inside a rechargeable battery
Supply and protection
How can a tiny control circuit switch a separate load?
Inside an isolated relay
Supply and protection
Why can a small leakage trip a device carrying a large load?
The current that did not return
Supply and protection
Why does an overload take time to trip a breaker?
The warming circuit breaker
Supply and protection
Can one coil change another coil’s voltage?
Trading voltage with coils
Access and detection
How does smoke send light to a detector outside the beam?
Light scattered by smoke
Water and garden
How does a float keep a basement pump from running dry?
The pump that watches water rise
Office and communication
What happens inside a mechanical keyboard switch?
Inside a tactile key switch
Audio and displays
Where does the back of a headphone driver push the air?
Open-back headphones
Workshop mechanisms
How do two threads become a lockstitch?
Two-thread lockstitch machine
18 experiments to explore. No account. Just curiosity.