an electric dryer consumes 6 joules of energy when operating at 220 volts for 3 minutes. during operation the dryer draws a current of approximately?

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abilopez2002 abilopez2002

12-04-2018
Physics

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an electric dryer consumes 6 joules of energy when operating at 220 volts for 3 minutes. during operation the dryer draws a current of approximately?

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egenriether egenriether · Answer 1 · 2018-04-12T14:09:27+02:00

Well, firstly 6 joules is a very low number for a dryer (impossibly low). But here is how you'd do it with a more realistic number:
Energy is the power consumed multiplied by the time over which it is consumed:

[tex]E=Pt \\ P= \frac{E}{t} = \frac{6J}{180s} =0.033W[/tex]

This power is current time voltage

[tex]P=VI =220V \times I=0.033W \\ I= \frac{0.033W}{220V}=0.152mA [/tex]

As you can see this current is very low by any household appliance standard, let alone an energy-hungry dryer! Are you sure it's not something more like
6×10⁵ J for the energy?