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Sewing Machine Vacuum
Power: Energy Transforms?
1. How much energy is transformed in each of the following appliances every second
(a) 1200 W heater
(b) 650 W microwave
(c) 85 W sewing machine
2. Calculate the power rating of
(a) An iron that transformers 1200 J of energy into heat energy each second.
(b) A light bulb transforms 6000 J of energy into heat and light energy in one minute
(c) A toaster that transforms 4000 J of energy into heat energy in five seconds.
(d) A vacuum cleaner that transforms 72000 J of energy into other forms of energy in one minute
1a) 1200 j
b) 650 j
c) 85 j
2a)1200w
b) 6000/60 = 100W
c) 4000/5 = 800 W
d) 72000/60 = 1200W
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