Question

a) Establish a relation between Sl unit and commercial unit of energy?

b) An electric geyser of 1.5kw works for two hours. Find the electrical energy units
consumed in a day?

c) If the heater consumers 60J in 1 min. What is its power?
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Answer 1

Explanation:

(a) SI unit of energy os joule.

commercial unit of energy is kilowatt hour.

the relation between the SI unit of energy and its commercial unit is--

1kwh=3.6×10^6J.

(b)

power=1.5kw

time=1/12 days

energy=?

H=Pt

H=1500×1/12

H=125J

for 2 hours then for 1 day, it would be 125×12=1500J.

(c) answer:

60 joules/60 seconds

=1watt