An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Approximately 2.81 × 1 0 21 electrons flow through the device delivering a current of 15.0 A for 30 seconds. This is calculated using the relationship between current, time, and charge. Using the charge of an electron, we determined the total number of electrons that passed through the device.
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In programming, loops are used to repeat a block of code while certain conditions are met. For this question, the key term is a loop that repeats as long as the Boolean expression is false.
Let's explore the options:
A) While Loop : This loop continues to execute as long as a specified condition (Boolean expression) is true . It checks the condition before executing the loop body. Thus, it does not fit the description of a loop that runs as long as the condition is false.
B) Do-Until Loop : This is commonly found in pseudocode or some specific programming paradigms. This loop executes the block of code at least once and then continues executing the block until the condition becomes true, meaning it keeps going while the condition is false. Therefore, "Do-Until" is the correct answer to this question.
C) For Loop : This is used for iterating over a sequence (like a list, tuple, dictionary, set, or string) and is typically used when the number of iterations is known. It doesn’t inherently rely on a Boolean expression being false to continue iterating.
The correct answer is B) Do-Until Loop. In essence, the Do-Until loop repeats the associated block of code as long as the Boolean expression remains false, and stops execution once the condition is met (true).
