Question

Calculate heat produced in 2 kw is of heater used daily 2hrs with 220 v supply.

Answer 1

Heat generated will be 14.4 megajoules

We know that energy generated is the multiplication of power and time.

Hence ,

Heat = power x time

we have power = 2 kw = 2000 w

time = 2 hrs = 2 x 3600 = 7200 sec

Hence,

Heat = 2000 x 7200

= 14400000

= 14.4 MJ

Hence heat generated is 14.4 megajoules.

Answer 2

Given:

Power = 2 kw

Time = 2 hrs

Current = 220 v

To find:

The heat produced.

Solution:

By formula,

Heat = power x time

Conversion

1 kw = 1000 w

Hence,

Power = 2 kw

Power = 2000 w

1 hr = 3600 s

Hence,

Time = 2 hrs

2 x 3600

Time = 7200 sec

Substituting,

We get,

Heat = 2000 x 7200

14400000

14.4 MJ

Hence, the heat produced in 2 kw is of heater used daily 2hrs with 220 v supply is 14.4 MJ