Etiket arşivi: of

Does limiting the power of appliances save energy?

Woman and hairdryer


The European Commission has banned the sale of powerful vacuum cleaners. Now it might do the same for other domestic appliances, but would this actually cut energy consumption?

It started with vacuum cleaners. Then there were howls of outrage when it emerged the European Commission has set up a working group to look at whether other common household appliances – kettles, toasters, bread makers and hairdryers among them – should also be regulated.

The working group is at an early stage and may rule out many of the products. But is the premise correct – does the power of an appliance determine energy consumption? Or by halving the wattage do you simply mean that someone uses it for twice as long?

Take hairdryers. You could use a 1,000-watt hairdryer for a minute or a 500-watt one for two minutes and it would in theory use the same energy. But, says Henry Lau, outreach officer at the Institute of Physics, it’s not that simple. You have to look at how efficient hairdryers actually are. “Part of the power is being used to power a heating element, you’ll get some energy wasted heating other parts of the hairdryer, not just the air.” Design matters – is it better to have faster-blown air, or hotter air?

For vacuum cleaners, better nozzle and filter design means that you can suck up more dust without increasing the power of the motor, says Chrissy McManus, technical manager at the Association of Manufacturers of Domestic Appliances. Which? Magazine has made the same point, while noting many of its Best Buys have motor sizes that exceed the new limit of 1,600 watts.

There’s no simple relationship between motor power and energy use, says Prof Will Stewart, fellow at the Institute of Engineering and Technology. And a big motor used at low power will use about the same energy as a smaller one doing the same job. But the EU is right to expect better efficiency. He estimates it should take about 2,000 watts of power applied for less than a minute to dry wet hair. Yet most hairdryers take far longer with similar or more powerful motors. The hope must be that manufacturers will do more with less power. But he wonders if regulation is necessary. “The hairdryer is a very small potato in terms of energy use.”

Subscribe to the BBC News Magazine’s email newsletter to get articles sent to your inbox.

Naked photos of celebrities leaked

Nude photos of celebrities including Jennifer Lawrence have been leaked online after an apparent hack.

While some stars have claimed the pictures are fake, others seem to have confirmed that it is them in the images.

The list of mostly female stars targeted also features names including Rihanna, Kate Upton, Selena Gomez and Kim Kardashian.

Lawrence’s agent said her team would be taking legal action.

This is a flagrant violation of privacy. The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence, her spokesperson told Newsbeat.

Mary Elizabeth Winstead, who has starred in films including A Good Day to Die Hard, also acknowledged the pictures were of her.

To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves she tweeted.

Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked

She later announced that she was going on an internet break because of the trolling she had received.

Great day for the block button, she added.

Former Nickelodeon star and singer Victoria Justice said the images claiming to show her naked were not real.

A spokesperson for musician Ariana Grande told BuzzFeed that the images said to be of her, were “completely fake.”

The list of celebrities who have supposedly been hacked is extensive and features other names including Avril Lavigne, Cara Delevingne, Jenny McCarthy and Kaley Cuoco.

Glee star, Becca Tobin also acknowledged her inclusion on the list with a jokey tweet saying Merry XXXmas

Hilary Duff, Amber Heard, Hayden Panettiere and Kate Bosworth also appear

A number of the stars on the list have trended on Twitter after the photos were shared online. Newsbeat is waiting for confirmation from the social media site about whether accounts found to be sharing the images are being suspended

Apple has yet to comment about claims that the person who stole the images obtained them by hacking into iCloud, the remote storage service