Do you know how much it costs to charge your phone in a year?

Have you ever wondered how much you spend to boot up your devices? Maybe you charge your gadgets all day without knowing how much it costs to keep them plugged in.

With the rapid increase in the use of electronic devices and gadgets, chargers and consequently electricity are a necessity and not a luxury.

Smartwatches, laptops, tablets and portable audio systems have also become part of people's everyday lives and to keep them running they need to be continuously fed with electricity.

Do we ever wonder how much we spend to power up these devices? Should we be worried about the same? I'll let you decide.

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Here's how much it costs to charge your gadgets:

To the nearest 10 kilowatt-hours, how much energy does it take to power your iPhone or Android for a year? What is a kWh? 10 kilowatt hours? Or how about 100 kwh? The answer is one kWh.

This is the amount of power it takes to run ten 100-watt light bulbs for one hour. 1 kwh costs about 12 cents, which is far from cause for embarrassment.

Your iPhone battery has a capacity of 1440 mAh, or about 5.45 watt-hours. If you charge and recharge your phone fully every day, you'd need to feed it about 2,000 watt-hours, or 2 kWh, over a year. At a cost of 12 cents per kWh, your phone consumes about a quarter of a year's worth of power.

According to the Electric Power Research Institute, keeping your iPad charged costs only $1.36 each year. The typical laptop, with its much larger screen, consumes about 72 kWh, which costs about $8 per year.

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But do you unplug your devices soon after they're fully charged? Or are you one of those people who keeps it plugged in overnight?

Fun fact: Even after your device is fully charged, it still draws about 2-4 W of electricity to maintain its charged state.

That little bit of power is actually wasted. If everyone unplugged their devices when they are fully charged, you could save a lot of electricity.

That's why PAC is on a mission to make you aware of your charging habits. We believe that collective awareness will make a big difference.

When you use the Power Aware charger, you can see how much power is being used by your devices by looking at the pulses, color and brightness of the light it emits.

It's a wonderful idea that physically highlights the problem of energy use and encourages people to think about how energy efficient their home's electrical appliances really are.

How exactly does it work?

Wires that light up and pulse to show how much energy is being used are placed in the cable. This indicates how much energy is being used at any given time.