How much does it cost to use a 1300 W blow dryer for 30 minutes?
Assuming the current unit price is rated at 10 cents/kWh.
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Answer:Total Heat produced during this interval of time
= power × time
= 1300 × 30 × 60 ( 60 is multiplied for converting minutes to seconds)
= 2340000 J
= 2.34× 10^6 J1 kwh
3.6 ×10^6 J for 3.6×10^6 J ,10 cent is required
for 2.34×10^6 J,
(2.34×10^6/3.6×10^6) × 10
= 0.65×10
=6.5 cent would be required
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