Molly Ayala
Many electrical appliances continue to draw a small amount of electricity when plugged in but not turned on. This is known as phantom or standby power, and it occurs when devices are plugged in but do not reach a complete shutdown. Examples of devices that draw power in standby mode include televisions, computers, microwaves, washing machines, and alarm clocks. This can result in wasted electricity and increased power bills over time.
| Characteristics | Values |
|---|---|
| Devices that use electricity when plugged in but not in use | Chargers, power strips, transformers, televisions, computers, routers, alarm clocks, radios, coffee machines, DVD players, digital clocks, laptops, printers, microwaves, washing machines, refrigerators, smartphones, iPhones |
| Average standby power consumption | 2.5 Watts (for various gadgets in a house) |
| Standby power consumption by iPhone chargers | 0.26 watts |
| Standby power consumption by other electronic devices | Up to 25 watts |
| Standby power consumption as a percentage of global energy usage | 2% |
| Standby power consumption as a percentage of CO2 emissions | 1% |
| Amount of electricity used by plugged-in devices when not in use | $19 billion per year in the United States |
| Energy-saving solutions | Unplugging devices, using power extension cords, smart sockets, power strips, or batteries |
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What You'll Learn
- Chargers use electricity when plugged in, even when not charging
- Soft switches on appliances mean they use electricity when off
- Phantom power or standby power is used by devices not in a complete shutdown
- Power strips can be used to control the flow of power to multiple devices
- The amount of electricity used depends on the device and its age/model
Chargers use electricity when plugged in, even when not charging
Many devices, including chargers, consume electricity when plugged in, even when not actively charging. This is known as "phantom power" or "vampire power". While the amount of power drawn by a single phone charger is very low, typically ranging from 0.05W to 0.1W or less, it can add up when multiple chargers are left plugged in. This idle power consumption contributes to energy waste and can result in slightly higher electricity bills.
The power draw of a phone charger is so minimal that it is challenging to measure without specialised equipment. However, when multiple chargers are plugged in simultaneously, the cumulative power draw becomes more significant. For example, if you have five chargers, each using 0.05W of idle power, the total power draw becomes 0.25W. Over a month, this can result in a minor increase in electricity costs, typically amounting to a few cents to a few dollars.
Chargers with no device attached still draw a tiny amount of power to detect when a device is connected and initiate the charging process. This standby power consumption is common in devices with "soft" buttons or those that can be activated remotely or at a specific time. While the impact of a single charger is negligible, the cumulative effect of multiple chargers and other electronic devices can contribute to higher energy consumption and costs.
To reduce vampire power, individuals can unplug chargers when not in use or utilise power strips that can be turned off when charging is not needed. Certain power strips are also being developed to detect when an energy need is present, preventing power draw when a device is not connected. Being mindful of idle power consumption and taking small actions can help save money and contribute to more sustainable energy practices.
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Soft switches on appliances mean they use electricity when off
Many modern appliances feature ""soft switches" that allow them to be turned off at the appliance but remain connected to an electrical source. This means that even when turned off, some appliances continue to draw a small amount of electricity, a phenomenon known as "phantom power" or "standby power".
Soft switches are typically small-travel push buttons that do not physically break the electrical circuit when the appliance is turned off. Instead, the appliance enters a "sleep" mode, where most of its functions are turned off, but a small amount of power is still required to monitor the power button and allow for features like wake-on-LAN, wake-on-keyboard, and automatic software updates. This can be particularly noticeable in appliances with digital displays, such as coffee machines, alarm clocks, and DVD players, which require constant power to display the time.
The amount of power drawn by appliances in standby mode can vary, with some devices using as little as 0.25 Watts of energy, while others may use up to 15 Watts. While the power drawn by a single appliance may seem insignificant, it can add up over time, especially when multiple appliances are left plugged in. This can contribute to increased energy costs and have a cumulative impact on the environment.
To reduce phantom power consumption, it is recommended to unplug appliances that are not in use, especially those with soft switches. Power strips can also be useful for controlling the flow of power to multiple devices, although it is important to ensure that the power strip itself is also turned off when not in use. Additionally, when purchasing new appliances, look for the Energy Star label, which certifies that the product is energy-efficient and does not draw phantom power.
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Phantom power or standby power is used by devices not in a complete shutdown
When devices are plugged in but not in use, they may still be consuming electricity. This is known as "phantom power" or "standby power". Standby power is electrical power used by appliances and equipment while switched off or not performing their primary function, often waiting to be activated by a remote controller.
Standby power is consumed for several reasons. For example, it may enable a device to switch on quickly without delays, such as with older CRT television receivers, where a small current was passed through the tube heater to avoid a long startup time. Standby power may also be used to power a remote control receiver, allowing the device to respond to signals from a remote control device. Additionally, standby power may be used to power displays, clocks, or other features without switching the equipment to full power.
Many devices in the average home consume standby power, including computers, televisions, alarm clocks, radios, modems, routers, and various appliances. Chargers also draw power from a wall socket, even when no device is attached. While the amount of power drawn by a single charger may be small, it can add up significantly when compounded over multiple devices over a year.
To reduce phantom power consumption, individuals can unplug devices when not in use, use power strips that can be switched off, or purchase energy-efficient products with the Energy Star label.
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Power strips can be used to control the flow of power to multiple devices
Power strips, also known as multi-sockets or power boards, are indeed a great way to control the flow of power to multiple devices. They are blocks of electrical sockets that attach to the end of a flexible cable, typically with a mains plug on the other end. This allows multiple electrical devices to be powered from a single electrical socket.
Power strips are particularly useful when many electrical devices are in proximity, such as audio, video, computer systems, appliances, power tools, and lighting. They are also handy for controlling the flow of power to large groups of objects. For example, if you have a lot of devices that are always plugged in but not always in use, you could plug them all into a power strip and simply switch the power strip off when the devices are not in use. This can help you save money on your energy bills and protect the environment.
Some power strips have additional features, such as overload protection, which is required in power strips sold in Australia and New Zealand. They may also include a circuit breaker to interrupt the electric current in the case of an overload or a short circuit, and some even provide protection against electrical power surges. Certain power strips are also being developed to detect when an energy need is present, and if the device is not connected, no power will be drawn. These are known as "smart power strips".
Smart power strips have two basic components: electrical outlets and circuitry that monitors and controls those outlets. They can detect when a device goes into standby mode and its power consumption drops, and they will then cut the power to that outlet while keeping the rest of the outlets in use on. Some smart power strips also have one or two unmonitored, always-on outlets for devices that always need power, like a cordless phone base or an alarm system.
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The amount of electricity used depends on the device and its age/model
The amount of electricity used by devices that are plugged in but not in use varies depending on the device and its age and model. Devices with "'soft'" switches, such as small-travel push buttons, will continue to draw power even when turned off, as the device needs to monitor the button to turn on when pressed. Devices with "'hard'" switches, which physically break the electrical circuit, will not draw power when turned off.
Some devices, such as chargers, are known to draw a small amount of power even when not actively charging a device. This is known as "phantom power" or "standby power". The amount of power drawn can vary depending on the age and model of the charger, with older models tending to draw more power. For example, the average iPhone charger has a standby power consumption of 0.26 watts when not in use, but can consume up to 2.24 watts when actively charging. Similarly, older models of desktop computers can have standby power consumption levels of up to 25 watts.
Other devices, such as digital clocks, coffee machines, and DVD players, maintain digital displays that light up with the time. Lighting these LED displays is a constant, small burden on your power supply. While unplugging these devices each time you use them can be frustrating, it is recommended to disconnect less frequently used devices.
Additionally, devices with power bricks or cubes, such as laptops and phones, are likely to use power even when no device is connected. Power strips can be useful for controlling the flow of power to large groups of objects, but they can also draw power if they are always on. Smart sockets or power strips that detect when an energy need is present and only draw power when a device is connected are being developed to mitigate this issue.
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Frequently asked questions
Yes, appliances still draw electricity even when they are turned off. This is known as "phantom power" or "standby power". It happens when electrical devices are plugged in and don't reach a complete state of shutdown.
It depends on the device. For example, a washing machine uses ~10W/12VA when "off", while a microwave uses 5W/50VA. Even if it's just a few watts, they add up to a lot of wasted electricity and an increased power bill over time.
Unplugging items or using surge protectors that cut off the power when devices are not in use can save a significant amount on your energy bills. Alternatively, you can use a power strip that you can turn on and off for your device chargers.
