There are 5 rooms in a house.Each room has 100W bulb and a 40W tubelight.If every day the bulb is use for 1hour and tubelight is use for 5hours in each room,then what will the cost of total electric energy consumed in 30days when one unit costs Rs.2.5

Q. Calculate the energy consumed by

2 k W

heater used for

1 h r

every day in a period of

30 days

A house hold use one heater of rated power 1000w for 1 hour a day, five bulbs of power 40w used for 5 hours a day and the fan of rated power 100w used for 10 hours a day. Find the number of units of electirical energy consumed in 10 days.

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There are 5 tube-lights each of 40 W in a house. These are used on an average for 5 hrs/day. In addition, there is an immersion heater of 1500 W used on an average for 1 hr/day. The number of units of electricity that are consumed in a month of 30 days is:

The correct option is C 75 unitsE=n1P1t1+n2P2t2E=5×40×5×30+1×1500×30 =200×150+45000E=75 kWh⇒E=75 units

There are $5$ tube-lights each of $40 W$ in a house. These are used on an average for $5 h r s / d a y$ . In addition, there is an immersion heater of $1500 W$ used on an average for $1 h r / d a y$ . The number of units of electricity that are consumed in a month of $30 d a y s$ is:

The correct option is C $75 u n i t s$
$E = n_{1} P_{1} t_{1} + n_{2} P_{2} t_{2}$
$E = 5 \times 40 \times 5 \times 30 + 1 \times 1500 \times 30$
$= 200 \times 150 + 45000$
$E = 75 k W h$
$\Rightarrow E = 75 u n i t s$