Question

There are $5$ tube-lights each of $40W$ in a house. These are used on an average for $5$ hours per days In addition, there is an immersion heater of $500W$ used on an average for $1$ hour per day. The number of electricity are consumed in a month is.

• A. $25$ units
• B. $50$ units
• C. $66$ units
• D. $100$ units

Answer 1

The correct option is C $66$ units

$5$ tube of $40w$ each $=40\times 5=200w/h$

$=200÷1000uwh$

$=0.2uwh$

$\Rightarrow$ Electric press of $500w=500\times 4=2000w/h$

$=2uw$

Now,

$\Rightarrow$ Power consumption of $5$ tuber in $30$ days $=(30\times 0.2)$

$=6uwh$

$\Rightarrow$ Power consumption of $1$ press in $30$ days $=(30\times 0.2)$

$=60uwh$

$\Rightarrow$ Total energy consumption by tube lights and press in $30$ days $=(60+6)$

$=66uwh$

Hence, the answer is $66$ units.