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This is a Science question

Control Variable

Explanation:

This is because time has to be the same for both materials throughout the experiment (an hour in this case).

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2nd control variable.

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the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation