Explain.
5. Solve the following examples.
a. An electric pump has 2 kW power.
How much water will the pump lift
every minute to a height of 10 m?
(Ans : 1224.5 kg)
b. If a 1200 W electric iron is used
daily for 30 minutes, how much
total electricity is consumed in the
month of April? (Ans :18 Unit)
Answers
Explanation:
(a) Power of the pump = 2kW
= 2000 W
time = 1 min
= 60 s
height = 10m
power = mass × g × height/ time
2000 W = mass × 9.8 m/s^2 × 10m / 60 s
120000 W = mass × 98
mass = 1224.5 kg
(b) Power = 1200 W
= 1.2 kW
Time used each day = 30 mins
= 0.5 hr
Units consumed each day = power × time
= 1.2 kW × 0.5 hrs
= 0.6 units
Number of days in April = 30
Units consumed in April = 0.6 × 30
= 18 units
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