شرکت در آزمون آنلاین انگلیسی 3 - انگلیسی 3 | آزمون شماره 11615

............................. His wife was ill with depression and he was responsible for caring for the children ranging in age from a newborn baby to a/an

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Suddenly, a whole series of most distant memories rose in his … and he remembered the days when he first loved her.

   Plant-e stands for plant electricity. The dream is that we can generate clean electricity from living plants via a unique technology. Researchers have discovered that living plants are a “green” power source: they can generate, by a single leaf, more than 150 Volts, enough to power 100 LED light bulbs at the same time. When wind blows into the plant and moves the leaves, they are capable to convert mechanical forces applied at the leaf surface into electrical energy day and night, summer and winter.

   In detail, the leaf is able to gather electric charges on its surface due to a process called contact electrification. These charges are then immediately transmitted into the inner plant tissue. The plant tissue acts similar to a “cable” and transports the generated electricity to other parts of the plant. Hence, by simply connecting a “plug” to the plant stem, the electricity generated can be used to power electronic devices.

The technology is based on natural processes and is safe for both the plant and its environment. Plant growth is not endangered by generating electricity, so plants keep on growing while electricity is being produced. This means that it is possible to generate electricity in the same area where food is produced, or where nature is protected. This system also provides other environmental advantages such as water storage and improved biodiversity.

 According to the passage, contact electrification is a process of converting … energy into electrical energy.