Beatrice Lang
How much electricity does your phone consume when it's plugged in? The answer depends on a few factors, such as the wattage of the charger and the number of times you charge your phone per day. Phone chargers typically use about 5 watts (W) of electricity, with some faster chargers using up to 20 W. If you charge your phone once per day, you'll use about 1.83 kilowatt-hours (kWh) of electricity per year, which will cost less than a dollar at average electricity rates. However, leaving a charger plugged in without a phone can still consume 0.1 to 0.5 watts, contributing to what's known as vampire energy – the electricity wasted by idle devices that are left plugged in.
| Characteristics | Values |
|---|---|
| Watts consumed by phone chargers | 5W on average; some faster chargers use up to 20W |
| Kilowatt-hours consumed by phone chargers per week/month/year (charging once per day) | 0.035 kWh/0.15 kWh/1.83 kWh |
| Kilowatt-hours consumed by phone chargers per week/month/year (charging twice per day) | 0.07 kWh/0.3 kWh/3.65 kWh |
| Kilowatt-hours consumed by a phone per year | 1 kWh |
| Kilowatt-hours consumed by a phone per year (if fully drained and recharged every day) | 2 kWh |
| Watts consumed by a fully charged phone plugged into the wall | 2.24 W |
| Watts consumed by a phone charger in no-load mode | 0.26 W |
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What You'll Learn
- Phone chargers use 5 watts of electricity, with faster chargers using up to 20 watts
- Chargers left plugged in without a phone consume 0.1 to 0.5 watts
- The number of times you charge your phone impacts electricity usage
- Chargers consume power even when not charging a phone
- A fully charged phone plugged in consumes 2.24 watts
Phone chargers use 5 watts of electricity, with faster chargers using up to 20 watts
Phone chargers are generally very cheap to run, costing about 26 cents to use one for a year. The wattage of a phone charger is a good indicator of how much electricity it consumes. Watts are the rate of electricity consumption, and are calculated by multiplying volts by amps.
Phone chargers typically use 5 watts of electricity per hour, though this can vary depending on the device and the type of charger. Some chargers use up to 20 watts per hour, particularly the “fast” chargers available for many phone models. A cordless phone, for example, uses between 2 and 3 watts of power per hour during active usage and when recharging.
It's worth noting that chargers continue to consume electricity even when they're not actively charging a device. This is known as "vampire energy" or "no-load mode". A charger in no-load mode consumes around 0.26 watts of electricity, while a fully charged cell phone plugged into the wall consumes about 2.24 watts, or 60% of the power it consumed while charging.
To put this into perspective, if you left a phone charger plugged in all year, it would consume as much electricity as running your coffee maker for 12 days straight. While the cost of running a phone charger may be minimal, the cumulative impact of millions of idle chargers left plugged in contributes to significant energy wastage and CO2 emissions.
To reduce energy consumption, it's recommended to unplug chargers when they're not in use. This can be done manually or by using smart sockets or extension cords with switches for each outlet.
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Chargers left plugged in without a phone consume 0.1 to 0.5 watts
Chargers that are plugged in without a phone attached do consume electricity, but the amount is minimal. Sources suggest that a charger without a phone consumes between 0.26 and 0.5 watts of power. This is referred to as "phantom load", "phantom consumption", "vampire power" or "idle load".
The exact amount of power consumed depends on the type of charger and the number of chargers. For example, a single charger may use 0.26 watts, whereas five chargers together may use 0.25 watts of power. The power draw of a phone charger is so low that it is difficult to measure without sensitive tools.
The cost implications of this power consumption are also minimal. For example, according to the US Energy Information Administration, the average cost of 1 kilowatt-hour (kWh) of electricity in the US is around 13 cents. If you have five chargers, each using 0.05 watts of idle power, the total power draw is 0.25 watts, which equates to 0.18 kWh per month, or 36.79 cents per year.
While the cost of leaving chargers plugged in without a phone is low, it is worth noting that this practice does contribute to energy wastage and unnecessary carbon emissions. Millions of idle chargers left plugged in 24/7 translate into millions of kilowatt-hours wasted every year, with each kilowatt-hour equalling about a pound of CO2 released into the atmosphere. Therefore, it is recommended to unplug chargers when they are not in use, or to use smart power strips that cut off power when devices are switched off.
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The number of times you charge your phone impacts electricity usage
The number of times you charge your phone has a significant impact on electricity usage. Phone chargers typically use about 5 watts (W) of electricity, with some faster chargers using up to 20 W. Assuming a full charge takes one hour, charging your phone once per day uses 0.035 kilowatt-hours (kWh) of electricity per week, 0.15 kWh per month, and about 1.83 kWh per year. On the other hand, charging your phone twice a day uses 0.07 kWh of electricity per week, 0.3 kWh per month, and about 3.65 kWh per year.
It's important to note that even when your phone is fully charged and still plugged in, it continues to draw a small amount of power. A fully charged cell phone plugged into the wall consumes about 2.24 watts, which is a significant proportion of the power it consumed while charging. This phenomenon is often referred to as "vampire energy," where devices silently draw electricity and increase your power bill.
The environmental impact of idle chargers is also significant. Millions of chargers left plugged in continuously contribute to wasted energy and increased carbon emissions. To reduce electricity usage and minimize environmental harm, it is recommended to unplug chargers when they are not in use or to use smart power strips that cut off power to idle devices.
Additionally, the type of phone and charging habits also influence electricity consumption. For example, an iPhone or Android phone under normal use conditions typically costs under a dollar for a full year to charge. However, if you fully drain and recharge your phone every day, it will consume about 2 kWh of electricity annually.
In summary, the number of times you charge your phone directly affects electricity usage. Reducing the number of charges, unplugging chargers when not in use, and being mindful of charging habits can help minimize electricity consumption and associated costs and environmental impacts.
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Chargers consume power even when not charging a phone
Phone chargers consume power even when they are not actively charging a phone. This is known as "vampire energy", where appliances suck electricity from wall outlets and inflate power bills. The amount of electricity consumed depends on the wattage of the charger. Standard phone chargers use about 5 watts (W) of electricity, while faster chargers can use up to 20 W.
A genuine Apple iPhone charger uses around 135 W of power a month, which equates to just over 1.5 kilowatt-hours (kWh) a year. This means that if you lived in Hawaii, where electricity costs are the highest in the US, this idle charger would cost you $0.46 a year. While this may seem insignificant, the cost adds up if you have multiple chargers plugged in.
According to the Berkeley Lab's testing, a cell phone charger in "no-load mode" (when it's plugged in but not charging a phone) consumes around 0.26 W. While this is a small amount, when multiplied by the number of idle devices in millions of households, these energy vampires are responsible for an estimated 10% of residential energy use, costing $4 billion annually.
To reduce this wasted energy, you can unplug your chargers when they're not in use or use smart power strips that cut off power to all devices at once. Modern phone chargers are also designed to be more energy-efficient, with features such as automatic power-off when the phone is fully charged or disconnected.
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A fully charged phone plugged in consumes 2.24 watts
A phone charger that is plugged into a power outlet will continue to draw power, even when the phone is not attached. This is known as "vampire energy", where devices silently suck electricity and inflate power bills and carbon footprints.
A fully charged phone that is left plugged in consumes 2.24 watts of electricity. This is around 60% of the power consumed while the phone is charging. To put this into context, if you charged your phone once per day, it would use 0.15 kilowatt-hours (kWh) of electricity per month, or about 1.83 kWh per year.
The amount of electricity consumed by a phone charger will depend on the wattage of the charger and the length of time it is plugged in for. Standard phone chargers typically use 5 watts (W) of electricity, while faster chargers can use up to 20 W. The wattage of a charger can be measured using a power meter, such as the WattsUp? PRO.
The cost of running a phone charger will depend on the cost of electricity in your region. For example, in the US, the average cost of 1 kilowatt-hour (1,000 watts) of electricity is around $0.13. At this rate, charging your phone once per day would cost less than $0.13 per month, or around $1.56 per year.
To reduce vampire energy consumption and save on energy costs, it is recommended to unplug phone chargers when they are not in use. This can be done manually or by using smart power strips that cut off power to all devices at once.
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Frequently asked questions
On average, phone chargers use about 5 watts of electricity. If you charge your phone once a day, it will use about 0.15 kilowatt-hours of electricity per month and 1.83 kilowatt-hours of electricity per year.
At an average price of 12 cents, your phone uses about a quarter's worth of electricity per year.
Yes, a smartphone charger consumes power even when it's not in use. According to tests, a genuine Apple iPhone charger uses around 135W of power a month, which equates to just over 1.5kWh a year.
