PLEASE HELP ME !!!!!!!

Mathematics

1 answer:

Svetach [21]2 years ago

4 0

Answer:

the 2nd one "78.5cm^2" hope this helped :) sorry if its wrong

Step-by-step explanation:

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Step-by-step explanation:

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The heat produced by current I is
H = I²R
where
R = resistance.
According to the formula, heat produced is proportional to the square of the current.

When a current of I = 2 amps is applied, the heat produced is
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This heat includes heat due to a fixed current of 2 amps, and heat due to a variable current of x amps.

Because the heat produced is proportional to the square of the current, write the expressions as
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The second term on the right is heat due to the fixed current of 2 amps, written as
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The first term represents heat due to variable resistance, written as
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Therefore the variable resistance is 10x, and the square of the variable current is x².

Answer:
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3 years ago

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