Question

2. Which of the following will work best as a tester for electric current?
a. Bulb
b. LED
C. CFL
d. Magnetic compass​

Answer 1

Explanation:

answer is option (d) magnetic compass

Answer 2

Answer:

b. LED

Explanation:

A light-emitting diode( LED) is a semiconductor device that emits light when an electric current overflows through it. When current passes through an LED, the electrons recombine with holes emitting light in the process. LEDs allow the current to flow in the forward direction and blocks the current in the rear direction. When the diode is forward prejudiced, the nonage electrons are transferred from p → n while the nonage holes are transferred from n → p. At the junction boundary, the attention of nonage carriers increases. The redundant nonage carriers at the junction recombine with the maturity charges carriers.

Some advantages of LEDs over Incandescent Power lights are

• LEDs consume lower power, and they bear low functional voltage.
• No warm-up time is demanded for LEDs.
• The emitted light is monochromic.
• They parade long life and ruggedness.

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