🎧 Sound & Devices
What do headphones and speakers have in common that lets them produce sound?
They both have a magnet and a coil of wire
What does “maglev” stand for?
Magnetic levitation
What do you need to make a single light bulb light up in a circuit?
A battery, a wire, and a light bulb connected in a closed loop
What is an electromagnet?
A coil of wire that creates a magnetic field when current flows through
What happens when you bring two like poles together?
They repel each other
How do wireless headphones work without wires?
They use a built-in battery and Bluetooth signals
How is a maglev train different from a regular train?
It floats above the track without touching it
What happens when there’s a break in the circuit?
Electricity stops flowing and the bulb goes out
What device switches current direction in a motor?
Commutator
Which material is most likely to be attracted to a magnet?
Iron
Why do larger speakers need more current?
To produce stronger forces for louder sound
Why does a maglev train experience less friction?
It doesn’t touch the track
What type of circuit causes all bulbs to go out if one breaks?
Series circuit
Why must the poles of an electromagnet switch in a motor?
To keep the coil spinning continuously
What is a magnetic field?
The invisible area around a magnet where magnetic force is felt
Why is digital music preferred over analog?
It’s easier to store and reproduce without losing quality
How do electromagnets move a maglev train forward?
By attracting and repelling using magnetic poles
Which type of circuit allows other bulbs to stay lit?
Parallel circuit
How do junkyard workers move cars?
With magnets on cranes
What do conductors have in common?
They contain metal