A student set up the circuits shown to investigate how current flows through a light emitting diode (LED) - Junior Cycle Science - Question c - 2017
Question c
A student set up the circuits shown to investigate how current flows through a light emitting diode (LED).
(i) In which circuit, A or B, would the LED light up when... show full transcript
Worked Solution & Example Answer:A student set up the circuits shown to investigate how current flows through a light emitting diode (LED) - Junior Cycle Science - Question c - 2017
Step 1
In which circuit, A or B, would the LED light up when the switch is closed?
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Answer
The LED would light up in circuit A.
Step 2
Explain your answer.
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Answer
In circuit A, the LED is forward biased, allowing current to flow through it when the switch is closed. In contrast, circuit B does not provide the correct polarity for the LED, preventing current from flowing.
Step 3
State an advantage of using an LED instead of a filament bulb.
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Answer
An advantage of using an LED is that it uses less current, making it more energy-efficient and cheaper to operate over time.
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