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spin [16.1K]
3 years ago
7

Need help!! How much energy is used by a microwave if 15 A of current run through it for a period of 20 minutes?

Physics
1 answer:
svetoff [14.1K]3 years ago
3 0

Well first of all, here's something you're going to need:

          Power = (energy) / (time)          1 watt = (1 joule) per second          
          Energy = (power) x (time)          1 joule = (1 watt) x (1 second)

At this point, your progress grinds to a stop, because, technically, the
current alone doesn't tell you the power.  In other words, 'Amperes'
alone doesn't give you the 'watts'.

             Power (watts) = (amperes) times (volts) .

So you need to either go ask somebody or else <em>assume</em> the <u>voltage</u>
of the outlet that the microwave oven is plugged into.  Without it,
the question can't be answered.

I'm going to assume that you live and go to school somewhere in the USA,
Canada, or Mexico.  If that's true, then the outlets in your house supply
electrical energy at 120 volts, and everything you plug into them is designed
to run on 120 volts.  Now you have enough information to solve the problem.

         Power = (15 amperes) x (120 volts) = 1,800 watts

         Energy = (power) x (time) =

                         (1,800 watts) x (20 minutes) x (60 seconds/minute) =

                           2,160,000 watt-seconds = <em>2,160,000 joules</em>

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Point charges q1=- 4.10nC and q2=+ 4.10nC are separated by a distance of 3.60mm , forming an electric dipole. The charges are in a uniform electric field whose direction makes an angle 36.8 ∘ with the line connecting the charges. What is the magnitude of this field if the torque exerted on the dipole has magnitude 7.30×10−9 N⋅m ? Express your answer in newtons per coulomb to three significant figures.

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Explanation:

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