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Q.

LED is used in circuits because


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a

It detects weak electric current

b

It detects chemical effects in circuit

c

It glows only when high electric current flows in circuit

d

None of above 

answer is A.

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Detailed Solution

LED is used in circuits because it detects weak electric current.
If the electric conductivity in a circuit is very small, then the current in the circuit may be very weak to detect. For the testing of weak electric current flowing through the circuit, we use LED (Light Emitting Diode). It is a device that starts to glow even when a weak electric current passes through it. Therefore, we can say that LEDs are used in circuits because they detect weak electric currents.
 
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