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HOME GADGETS EXPLAINED

How It Works UK

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Issue 202

We often take the technology that keeps our homes running for granted, but here's how they actually work

- WORDS DUNCAN GEERE

HOME GADGETS EXPLAINED

ENERGY-SAVING BULBS MAKING GAS GLOW

Traditional light bulbs work by passing a current through a thin wire. The wire then heats up so much that it glows and gives off light. That takes a lot of energy, and much of it is wasted as heat. An alternative, the fluorescent lamp, became popular in 1938. Today's energy-saving light bulbs, called compact fluorescent lamps, or CFLs, are merely small cousins of the fluorescent tubes you see in offices. They're filled with a gas that releases ultraviolet photons - particles of light - when an electrical current is passed through them. The inside of the tube has a coating of phosphors. When the photons hit the inside of the tube, the ultraviolet light is converted to visible light and your room lights up. They are more efficient than traditional bulbs and work out cheaper in the long run.

More recently, these bulbs have begun to be replaced with LEDs, which generate light using yet another method - the movement of electrons in a semiconductor. These are safer, longer lasting and more energy efficient than CFLs.

WI-FI SENDING PULSES THROUGH THE AIR

Beaming information through the air seems magical, but we've been doing it even since our ancestors started communicating with smoke signals.

How It Works UK से और कहानियाँ

How It Works UK

How It Works UK

UNCANNY'S DANNY ROBINS

The creator and host of the BBC's Uncanny series tells us about his most chilling experiences while researching the show, and writing a ghost book for children

time to read

4 mins

Issue 208

How It Works UK

How It Works UK

HOW FEATHERS GROW

A bird's proteinaceous plumage comes from the same source as our hair

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

New EV battery technology could power 500-mile road trips on a 12-minute charge

Scientists have used a neat chemistry trick to tackle a major challenge facing future batteries.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

HOW AIR PURIFIERS WORK

These filtration devices clean a room's air of particles that can make a person sick

time to read

1 min

Issue 208

How It Works UK

How It Works UK

Chinese scientists hunt for alien radio signals in a 'potentially habitable' star system

TRAPPIST-1 is a red dwarf star located about 40 light years away that hosts seven Earth-sized rocky planets, with at least three orbiting in the habitable zone where liquid water could exist.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

WHAT HAPPENS WHEN WE DIE?

Our bodies are vessels for life, but in death they undergo a cascade of chemical and biological changes

time to read

3 mins

Issue 208

How It Works UK

How It Works UK

WHY ARE KEYBOARDS QWERTY?

There's a reason why this seemingly random arrangement of letters is widely used on keyboard layouts

time to read

1 min

Issue 208

How It Works UK

How It Works UK

A 'quasi-moon' discovered in Earth orbit may have been hiding for decades

A new paper describes a possible 'quasi-moon' of Earth, an interloping asteroid that may have been following our planet around for decades, undetected.

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

WHAT'S AN ANTI-DRONE GUN?

How these devices intercept and disable unmanned aerial vehicles

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

Dozens of mysterious blobs discovered inside Mars may be 'failed planets'

Giant impact structures, including the potential remains of ancient ‘protoplanets’, may be lurking deep beneath the surface of Mars.

time to read

2 mins

Issue 208

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