Molly Ayala
Leaving a device plugged in and switched on will use electricity even if the device is not in use. This is because electricity is a form of energy, and when an appliance wastes electricity, it means that the work the appliance did with the electricity was wasteful. For example, a lamp plugged in allows electricity to reach the lightbulb, but only if the lightbulb switch is also turned on. On the other hand, a washing machine won't work if it's unplugged, and it also doesn't do any work if the switch is off. So, there's no energy gain to be had from unplugging a washing machine.
Does leaving the switch on waste electricity?
| Characteristics | Values |
|---|---|
| Cost of leaving a light on overnight | £23 per year |
| Cost of leaving a TV on standby | £30 per year per set |
| Cost of leaving a TV box on standby | £26 per year |
| Cost of leaving a speaker on standby | £6 per year |
| Cost of charging a phone overnight | £3 per year |
| Cost of leaving a microwave on standby | £5 per year |
| Cost of leaving a printer on standby | £5 per year |
| Cost of leaving appliances on standby | £120 per year |
| Electricity wasted by a plugged-in device with no switch | Depends on the device |
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What You'll Learn
Plugged-in devices use electricity even when off
Even when they are turned off, plugged-in devices continue to draw a small amount of electricity. This is known as "phantom power" or "standby power", and it occurs when electrical devices are plugged in but do not reach a complete shutdown.
While the power draw is low, it can add up over time, especially if multiple devices are left plugged in. For example, an average printer left on standby mode costs almost three times more than a printer that is switched off at the plug, emitting unnecessary energy. Similarly, speakers cost approximately £6 a year to remain on standby, wasting 90.32 watts of power per day. Microwaves are another example of a device that is often left on standby, costing households an extra £5 per year.
To reduce the amount of wasted electricity, it is recommended to unplug devices when they are not in use or to use surge protectors that cut off the power when devices are not in use. This can help reduce energy bills and lower a household's environmental impact.
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Standby mode wastes electricity
Standby power is one of the leading causes of high energy bills for both households and companies. It is also one of the most significant contributors to global energy consumption, accounting for 10% of all electricity use worldwide. In an average UK household, £147 a year could be saved by eliminating standby power.
Appliances and devices with standby modes, such as microwaves, printers, speakers, computers, and phones, continue to consume energy even when not in use. This is because they need to be ready for any command at any time, such as detecting software updates or responding to voice commands. For example, a microwave uses about 3 watts when not in use, a printer in standby mode costs almost three times more than when switched off, and speakers cost approximately £6 a year.
To reduce standby power consumption, it is recommended to switch off devices at the plug socket or wall, preventing the electrical current from flowing through. Energy-saving modes, which can be activated through settings or instruction manuals, can also help by stopping devices from checking for updates or messages while on standby. Additionally, smart plugs can be used to automatically turn off electronics when they are not in use.
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Lights left on waste electricity
There are conflicting opinions on whether leaving lights on wastes electricity. Some sources claim that leaving lights on does not waste much electricity or money, especially if the lights use low-energy light bulbs. However, other sources argue that leaving lights on in an empty room is a waste of electricity and can add to energy bills.
Leaving a light on in an unoccupied room is an example of work being done that is not beneficial and can be considered a waste of electricity. Experts advise switching off devices at the plug socket to prevent electrical current from flowing through. This is because even when a device is switched on but not in use, it may still be using electricity. For example, a television with instant-on capabilities uses a small amount of electricity continuously while waiting to receive a signal. Similarly, appliances with LED displays that stay lit up, such as DVD players or game consoles, are consuming electricity without providing any useful work.
The impact of leaving lights on may depend on the type of light bulb used. Traditional incandescent light bulbs are less energy-efficient than newer LED or fluorescent light bulbs. LED lights, in particular, are known for their energy efficiency and long lifespan. Therefore, leaving modern LED lights on may result in less electricity wastage compared to older types of light bulbs.
While leaving a single light on may not significantly impact your electricity bill, the cumulative effect of multiple lights left on can be more substantial. Additionally, other factors, such as the power consumption of the lights and the duration they are left on, will also influence the overall electricity usage.
To reduce electricity wastage, it is recommended to develop habits such as turning off lights when leaving a room or unplugging devices when they are not in use. These small changes can collectively make a difference in reducing energy consumption and saving money on electricity bills.
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Older appliances waste more electricity
Even when not in use, any device that is plugged in and switched on will use electricity. This is why experts advise switching off objects at the plug socket. While leaving a light on overnight can add £23 to your energy bills over a year, other appliances can also add to your bill. For example, an average printer left on standby mode costs almost three times more than a printer switched off, emitting unnecessary energy. Microwaves, speakers, and phone chargers are other examples of devices that are often left on standby, costing households extra money.
Older appliances are also more likely to waste electricity. If a major appliance is over 10 years old, it has reached the end of its planned obsolescence. New appliances use less energy, and swapping out old appliances for more energy-efficient ones will save you money on utility bills and help reduce greenhouse gas emissions. For example, new washing machines with the Energy Star label use 25% less energy and 70-75% less water than agitator washers from 20 years ago. American consumers have saved on average $500 per year per household on utility bills since the National Appliance Energy Conservation Act of 1987.
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Unplug devices to save electricity
Leaving a device plugged in and switched on will use electricity even if the device is not in use. This is because, in standby mode, devices are still connected to a power source and remain responsive. This is known as 'phantom' or 'vampire' power. Therefore, it is important to unplug devices to save electricity.
Entertainment setups, such as stereo equipment, TVs, cable boxes, and game consoles, are some of the biggest culprits when it comes to phantom power use. These devices can draw up to 38 watts per hour when on standby, which can add up to significant electricity costs over time. Other common household appliances that use electricity when left on standby include computers, printers, speakers, microwaves, and chargers for phones and laptops.
To save electricity and reduce energy costs, it is recommended to unplug devices that are not in use. This can be done manually by physically unplugging the device or by using power strips with switches to turn off multiple devices at once. Smart plugs are also an option, as they can automatically cut the power when a device is fully charged or after a set amount of idle time.
By unplugging devices, you can not only save money on your electricity bills but also reduce your carbon footprint and contribute to a more sustainable lifestyle. Additionally, unplugging devices can help protect them from power surges and prolong their lifespan by preventing overheating and minimizing mini-charging cycles.
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Frequently asked questions
Yes, if you leave a device plugged in and switched on, it will use electricity even if the device isn't in use. This is why experts advise switching off objects at the plug socket so the electrical current is unable to flow through.
Some devices that waste electricity when left on include speakers, microwaves, printers, and phone chargers.
The amount of electricity wasted depends on the device. For example, leaving a light on overnight can add £23 to your energy bills over a year, while speakers cost approximately £6 a year to leave on standby.
