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rodikova [14]
3 years ago
15

A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?

Physics
1 answer:
weeeeeb [17]3 years ago
3 0
<span>A joule is equal to one watt per second and so we must find out how many seconds are in two hours. A shortcut you can use is remove the zeros and multiplying the remaining numbers before adding the the zeros back to the total of your result 6 x 6 x 2 = 72 and thus 60 x 60 x 2 = 7200 72 x 15 = 1080 and thus 7200 x 1500 = 10800000 joules one mega joule equals one million joules So we can simplify things and say 10.8 MJ</span>
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lukranit [14]

Answer:

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d)

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Explanation:

b)

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Therefore,

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<u></u>

a)

From Ohm's Law:

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Therefore,

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c)

For constant resistance and 110 V the power becomes:

P = V²/R

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d)

If the resistance decreases, it will increase the current according to Ohm's Law. As a result of increase in current the power shall increase according to formula (P = VI). Therefore, correct option is:

<u>c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.</u>

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