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Which of the following is true about working of a photocell
- a)It converts electricity into light
- b)It converts light into electricity
- c)It stores light
- d)It stores electricity
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is true about working of a photocella)It conver...
Understanding Photocells
Photocells, also known as photoresistors or light-dependent resistors (LDRs), are devices that play a crucial role in converting light energy into electrical energy. Here's a detailed explanation of how they work.
How Photocells Operate
- Photocells are made from semiconductor materials that exhibit a change in resistance when exposed to light.
- When light photons hit the surface of the photocell, they excite electrons in the semiconductor material. This process leads to an increase in the number of free charge carriers (electrons).
- As a result, the resistance of the material decreases, allowing more current to flow through the circuit. This conversion of light energy into electrical energy is what makes photocells effective.
Applications of Photocells
- Photocells are widely used in various applications, such as automatic street lighting, solar garden lights, and alarm systems.
- They help in energy conservation by ensuring that lights are only activated in low-light conditions, thus optimizing electricity usage.
Why Other Options Are Incorrect
- Option A (It converts electricity into light): This is the function of devices like light bulbs or LEDs, not photocells.
- Option C (It stores light): Photocells do not store light; they only convert light into electricity.
- Option D (It stores electricity): Photocells generate electricity but do not have the capacity to store it. Energy storage is typically the function of batteries.
In summary, the correct answer is option B as photocells effectively convert light into electricity, making them essential components in various light-sensing applications.
Photocells, also known as photoresistors or light-dependent resistors (LDRs), are devices that play a crucial role in converting light energy into electrical energy. Here's a detailed explanation of how they work.
How Photocells Operate
- Photocells are made from semiconductor materials that exhibit a change in resistance when exposed to light.
- When light photons hit the surface of the photocell, they excite electrons in the semiconductor material. This process leads to an increase in the number of free charge carriers (electrons).
- As a result, the resistance of the material decreases, allowing more current to flow through the circuit. This conversion of light energy into electrical energy is what makes photocells effective.
Applications of Photocells
- Photocells are widely used in various applications, such as automatic street lighting, solar garden lights, and alarm systems.
- They help in energy conservation by ensuring that lights are only activated in low-light conditions, thus optimizing electricity usage.
Why Other Options Are Incorrect
- Option A (It converts electricity into light): This is the function of devices like light bulbs or LEDs, not photocells.
- Option C (It stores light): Photocells do not store light; they only convert light into electricity.
- Option D (It stores electricity): Photocells generate electricity but do not have the capacity to store it. Energy storage is typically the function of batteries.
In summary, the correct answer is option B as photocells effectively convert light into electricity, making them essential components in various light-sensing applications.
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Which of the following is true about working of a photocella)It conver...
Photocell converts light energy into electrical energy.
When light falls on conducting/semiconductor material, electron start to flow which creates electricity.
When light falls on conducting/semiconductor material, electron start to flow which creates electricity.
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Which of the following is true about working of a photocella)It converts electricity into lightb)It converts light into electricityc)It stores lightd)It stores electricityCorrect answer is option 'B'. Can you explain this answer?
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