Question

a 200 watt bulb is lighted for 2 hours how much energy is consumed​

Answer 1

Answer:

400 J

Explanation:

Given, Power = 200W, time = 2h

We know that

Energy = Power x time

⇒ Energy = 200 x 2 = 400J

Hope it helps!

Answer 2

$\huge {\red{\boxed{ \overline{ \underline{ \mid\mathfrak{An}{\mathrm{sw}{ \sf{er}} \colon\mid}}}}}}$

We have formula :

$\large \star {\boxed{\sf{Energy \: = \: Power \: \times \: time}}} \\ \\ \implies {\sf{Energy \: = \: 200 \: \times \: 2}} \\ \\ \implies {\sf{Energy \: = \: 400 \: Wh}} \\ \\ \implies {\sf{Energy \: = \: 0.4 \: kWh}}$

$\therefore$ Energy consumed is 0.4 kWh

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Additional information :

➠ Energy is denoted by E .

➠ Unit of energy is Joule (J), commercial unit of energy is kWh

➠ Energy = Power × time