Question

Energy used by a 1.5kw heater in 5 minute

Answer 1

U=P×t
=1.5 ×(5×60) s
1.5×300
450kw..ans

Answer 2

Answer:

The energy used by the heater is $\bold{4.5 \times 10^{5} \mathrm{J}}$

Explanation:

We have to find the energy consumption of the heater when it is heated in 5 minutes with the power of 1.5kw

We know that

Energy = power × time  

Here Power = 1.5kW

Convert kw into w so we get the value as

$1.5 \times 10^{3} \mathrm{W}$

Time taken = 5 minutes

Convert minutes into seconds

Then

= 5 × 60 sec

= 300 sec  

Now substitute the value in the energy formula

Then we get

energy = $1.5 \times 10^{3}$ x 300

By simplification

$=4.5 \times 10^{5} \mathrm{J}$

Hence energy used by heater $=\bold{4.5 \times 10^{5} \mathrm{J}}$ in 5 minutes with the power consumption of 1.5kw