-D1 in Figure will be on when the output from the driving circuit is
A) 0 V.
B) +5 V.

Name: -D1 in Figure will be on when the output from the driving circuit is A) 0 V. B) +5 V.
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Question

-D1 in Figure  will be on when the output from the driving circuit is
A) 0 V. 
B) +5 V.

Quizplus · Accepted Answer

D1 is a common-anode LED. When the output from the driving circuit is 0 V, the anode of D1 is at 0 V and the cathode is at +5 V, so D1 will be on.

-D1 in Figure Will Be on When the Output