Question

in our house two 60 electric bulbs are lighted for 4 hours and 300 watt bulb for 5 hours everyday calculate the electric energy consumed in 30 days​

Answer 1

Explanation:

We know,

Relation between Power and Work or energy

P=W/t

W=Pt

energy consumed per month for 60 watt electric bulb:

P=60watt

t=4hour/day

=4×60×60×30 sec/month

=432000 sec/month.

Energy consumed per month

W=Pt

=60×432000 jule

=25920000

$2.592 \times {10}^{7} jule$

energy consumed per month for 300 watt electric bulb:

P=300watt

t=5hour/day

=5×60×60×30 sec/month

=540000 sec/month.

Energy consumed per month

W=Pt

=300×540000 jule

=162000000jule

$16.2 \times {10}^{7} jule$

total energy consumed per month:

$2.592 \times {10}^{7} + 16.2 \times {10}^{7} \\ 18.792 \times {10}^{7} \\1.8792 \times {10}^{8}$

N.B. kilowatt-hour is also a unit of electrical energy but that is not a SI unit. kilowatt-hour is a commercially used unit which is also known as UNIT.