Question

An electric bulb of 40 W is used for 9 h per day. The units of energy consumed in one day by the bulb is
Options
36
360
0.36
0.44​

Answer 1

Explanation:

P=E/t

P=40W, t=9h

E=P*t

=40*9=360Wh=0.36KWh

kWh=unit

hence,0.36 units of energy is consumed in one day

Answer 2

${ \large { \underline{\sf {\red{What \: is \: electrical \: energy? }}}}}$

Electrical energy, we can say is the movement of electrons from one place to another. Electrical energy is derived from electric potential energy and kinetic energy.

${ \large {\underline{ \sf {\color{navy}{Electric \: energy \: consumed:}}}}}$

Electric power consumption is the total electric enegy consumed by an electronic device. Its unit is kilowatt (kWh) To find electric energy consumed by a device:-

$\sf{Electric \: Energy \: consumed = power \times time }$

${ \huge{ \underline{ \sf \red{Question:}}}}$

Find the electric energy consumed by a bulb of 40W in 9 hrs.

${ \huge {\underline {\sf \blue{Answer:}}}}$

$\sf{Given:-}$

$\sf{A \: bulb \: of \: 40W \: is \: used \: for \: 9 hrs}$

$\sf{Electric \: energy \: consumed =40 \times 9 = 360}$

$\sf = > \frac{360}{100</strong><strong>0</strong><strong>} = </strong><strong>0</strong><strong>.</strong><strong>3</strong><strong>6kwh$

So the total electric energy consumed by the bulb in 9 hrs i 0.36kWh

$\large \sf \red{Hope \: it \: helps \: you........}$