请说明为什么使用发光 LED 需要接限流电阻,当高电平为 +5V 时,正常点亮一个发光 LED 需要多大阻值的限流电阻(设 LED 的正常工作电流为 20mA ,导通压降为 2V ),为什么?
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举一反三
【单选题】Prior to recording adjusting entries, the Office Supplies account had a $359 debit balance. A physical count of the supplies showed $105 of unused supplies available. The required adjusting entry is:
A.
Debit Office Supplies $105 and credit Office Supplies Expense $105.
B.
Debit Office Supplies Expense $105 and credit Office Supplies $105.
C.
Debit Office Supplies Expense $254 and credit Office Supplies $254.
D.
Debit Office Supplies $254 and credit Office Supplies Expense $254.
E.
Debit Office Supplies $105 and credit Supplies Expense $254.
【单选题】Prior to recording adjusting entries, the Office Supplies account had a $359 debit balance. A physical count of the supplies showed $105 of unused supplies available. The required adjusting entry is:
A.
Debit Office Supplies $105 and credit Office Supplies Expense $105.
B.
Debit Office Supplies Expense $105 and credit Office Supplies $105.
C.
Debit Office Supplies Expense $254 and credit Office Supplies $254.
D.
Debit Office Supplies $254 and credit Office Supplies Expense $254.
【单选题】Office supplies purchase of $900 were debited on Office Supplies on Hand. Account of the supplies at the end of period showed $500 still on hand. Make the adjusting entry at the end of the period.