Question

an electric heater of power 3kw is used for 10h how much energy does it consume express your answer kwh and Jule
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Answer 1

Answer:

Power=3kw

Time=10h

Electric Energy=Electric power×Time

=3kw×10h

=30kwh.....

As we know 1kwh=1000kwh

therefore = (1000w)×(60×60s)

=3.6×10^6J..

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Answer 2

$\checkmark$ Given:

An electric heater of power 3 KW is used for 10 h

$\checkmark$ To Find:

How much energy does it consume

• kWh
• Joule

$\checkmark$ Solution:

We know that,

$\red{\bigstar \ \boxed{\rm E=P \times t}}$

Here,

• E = Energy
• P = Power
• t = time

According to the question,

We are asked to find how much energy does it consume

• kWh
• Joule

Given that,

An electric heater of power 3 KW is used for 10 h

Hence,

• P = 3 kW
• t = 10 h

Substituting the values,

We get,

$\blue{\rm \implies E=(3 \times 10) \ kWh}$

$\green{\rm \implies E=30 \ kWh}$

We know that,

$\orange{\rm 1 \ kilowatt \ hour \ (kWh)=3.6 \times 10^{6} \ J}$

Therefore,

$\blue{\rm E= 30 \ kWh=30 \times 3.6 \times 10^{6} \ J}$

Hence,

$\pink{\rm \implies E=108 \times 10^{6} \ J}$

Therefore,

$\star$ Energy consumed (E)

• E (in kWh) = 30 kWh
• E (in Joule) = 108 x 10⁶ J