PFY, p. 120
f) power is the rate of doing work.
power (in watts) = work done ( in joules) / time (in seconds)
g) 1 watt is a rate of working of one power joule per second.
13. P=E/t 1000/5= 200watts
14. P= E/t (300 x 2) / 6= 100watts
16. P= E/t (3000 x 10) / 4 = a) 7500watts
b) 7.5 kilowatts
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