Question
$LED$ is used in a circuit. Explain why.
✓
Answer
If the current through a circuit is very weak, then a bulb cannot detect the current passing through it. It is because the current is not enough to heat up the filament of the bulb. Thus, $LED$ is used to detect weak current in a circuit.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
All liquids conduct electricity. Comment.
Figure shows a car sticking to an electromagnet. Name the forces acting on the car. Which one of them is larger ?
A gland $W$ is located just below the stomach in the human body. The gland $W$ secrets a hormone $X.$ The deficiency of hormone $X$ in the body causes a disease $Y$ in which the blood sugar level of a person rises too much. The person having high blood sugar is called $Z.$ What are $W, X, Y$ and $Z?$
→Why do they appear to move in this direction?
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate? Will we be able to hear the sound? Explain.
Is there any relation between size of organism and number of cells?
Write down to everyday uses of a Convex lens.
What is desertification? Name one human activity which may lead to desertification.
You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two ?
Mention the functions of albumin in egg.