Question

The amount of heat energy produced in 5minutes by an electric heater rated at 1000 W
is:
(a) 2 x 10^5 j
(c) 4 X 10^5 j
(b) 3 X 10^5 j
(d) 300 J​

Answer 1

Answer:heat energy=power*time                         time in seconds=5*60= 300

                                 =  1000*300

                       =3*10^5 j

Explanation:if it helps mark as brainliest

Answer 2

Answer:

The amount of heat energy produced by an electric heater is  3×10⁵J i.e. option(b).

Explanation:

The power of a substance is defined as the rate of doing work, and it is the amount of energy consumed per unit of time for a device. It is expressed in "watt".

$Power=\frac{Energy}{Time}$            

As per the question we have,

Power=1000 W=1000 J/sec

Time=5 minutes=5×60=300sec

By substituting these values in the above equation we get;

$1000=\frac{Energy}{300}$

$Energy=3\times 10^5 J$

Hence, The amount of heat energy produced in 5minutes by an electric heater rated at 1000 W is 3×10⁵J i.e. option(b).