According to the British Daily Mail, from solar energy to human excrement, scientists have proposed a number of alternatives that can be used to charge mobile phones. But if the corresponding technology exists, can we charge the device by plugging the device directly into the brain? Maddie Stone, the American technology blogger Gizmodo, calculated the required energy and found that theoretically, the brain generates energy that can charge an iPhone 5C for 70 hours.
The brain has hundreds of billions of conductive "wires"
Everything we do is controlled and promoted by electrical signals that flow through the entire body. When the atoms exchange charge, that is, they are positively charged or negatively charged, the cell membrane produces electricity. It is this transformation that allows electrons to move from one atom to another. This is what we call electricity. When scientists talk about the nervous system sending "signals" to the brain, or "emitting" synapses, they talk about the flow of current at different nodes. The brain has hundreds of billions of conductive "wires," Stone explains.
Every time a neuron “emits†it generates 1 nanoamperes of electricity
Each time a neuron "emits" it will cause a subtle change in voltage, which will produce a one-minute flow of current - this is equivalent to 1 nanoampere - according to Peter Thierry, a biophysicist at the University of Washington. Bertil Hille said so.
Although this is a very small amount, the human brain contains 80 billion neurons, and it is said that about 1% of neurons fire at any given moment. So if 800 million neurons stay active at a time, the power output it produces is equivalent to 0.085 watts of power, which is roughly equivalent to the power needed to drive a power-saving LED bulb.
This means that if you charge an iPhone 5C, which has about 5.74 watts of electricity per hour, the brain needs to work 68 hours to charge the device. Stone said: "It doesn't sound particularly efficient, especially compared to a standard communicator, which typically charges the phone in just 70 minutes." It's worth mentioning that we can't harvest energy from our brains. .
However, even if we can, there is still a problem in this, because there is no extra electricity to perform other necessary operations to ensure the normal operation of the body. If 1% of brain power is transferred to charge the device, it takes 285 days to complete the charging of this device.
Another similar issue that was recently proposed to Naked scientists at Cambridge University is whether people can use USB plugs for charging. Chris Smith, a Cambridge University medical consultant, responded that the maximum energy delivered from USB is 15 watts, which is equivalent to 15 joules per second.
One calorie is equivalent to 4200 joules, so if you eat 2,000 calories per person per day, then he consumes about 8 million joules of energy. Smith then divides 8 million by 4200 to figure out how long it takes to use a USB plug to get one person to get this energy. As a result, if a USB plug is used, it takes six days for one person to obtain the equivalent of the energy provided by one day's food. "I think I still choose food," said Smith.
Scientists at the Howard Hughes Medical Institute this week used a technique called light-sheet microscopy to study the central nervous system of fly larvae 1 mm long. Scientists use lasers to illuminate this species from both sides while using a camera to record the images of the front and back ends. The researchers genetically modified the neurons so that each cell emits light when the neuron fires, and the nerve activity is recorded. This shows how the signal emitted by the larval nervous system causes the body to move.
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