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Look carefully at the circuit diagram and then state which bulb/s, if any, light when the switch is closed - Junior Cycle Science - Question c - 2007
Question c
Look carefully at the circuit diagram and then state which bulb/s, if any, light when the switch is closed. Give a reason for your answer. Which? Reason
Worked Solution & Example Answer:Look carefully at the circuit diagram and then state which bulb/s, if any, light when the switch is closed - Junior Cycle Science - Question c - 2007
Step 2
Reason
Answer
The diode with bulb A is in forward bias, allowing current to flow. This is because the positive end of the diode is connected to the positive pole of the battery when the switch is closed. Thus, current flows through bulb A, causing it to light.
Bulb B does not light because it is in reverse bias; the connection does not allow current to flow through it.