Question

An electric heater is used for 2 H at 220 V. What is net energy consumed?​

Answer 1

Answer:

Power is energy consumed per unit time.

Here, energy consumed=P=2kW=2000W and time=t=10hr=36000s

P=

t

E

⟹E=Pt=2kW×10h=20kWh=20units

Since 1unit=1kWh

Cost=20×350=Rs7000

Explanation:

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Answer 2

Given:

voltage = 220v

time = 2hrs

To Find:

Energy consumed

Solution:

let

power = 2Kw

we know,

Energy  = Power  * time

Energy = 2Kw * 2Hrs

Energy = 4 kWh = 4 units     (since, 1 kWh = 1 unit)

So, the net energy consumed = 4 units.