2.9 if an industrial battery can turn a motor/machinery fixture for 8 hours and
ID: 2268157 • Letter: 2
Question
2.9 if an industrial battery can turn a motor/machinery fixture for 8 hours and the motor is rated at 2hp, how much energy is stored in the battery in J? In kwh 1 hp= 746 w
2.11 a house contains five 60w, two 75w and three 40w lightbulbs. If electricity costs $.12/kwh, and the lights are on for 9 hours per night, determine (a) amount of energy used per night in kwh and (b) the total cost per night.
2.22 Assuming a source voltage of 0.8v, determine the current in a 50 mw led.
2.35 what is the current flow through a 12.5kohm resistor if 3.0MV are applied?
2.43 if the voltage drop across a lighting circuit is 120v, what is the power dissipated if the lights have an operating resistance of 144 ohms?
2.46If a copper wire has a diameter of 4.54 mm and a length of 38.5 m, what is its resistance at room tempature?
Explanation / Answer
(2.9)
Motor rating is,
P=2hp
= 2*746
=1492 W
Calculate the energy.
w= pt
=1492*8
=11936
=11.936 kwh
It is known that,
1kwh= 3600000 J
Therefore,
w= 11.936*3600000
=42.969*10^6 J
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