Question

Energy used by a 1.5kw heater in 5 minutes is

Answer 1

Answer:

E = 450 kJ

Explanation:

According to the given question,

t = time = 5 min = 5×60 = 300 sec

P = Power = 1.5×10^3 Watt = 1500 Watt

E = Energy = ?

We are asked to find the energy.

We know,

• Energy = Power × time

• E = P×t

• E = 1500×300

• E = 45×10^4

• E = 450 kJ

Thus energy used by a 1.5kW heater in 5 min is 450kJ.

Answer 2

Answer:

$\large{\underline{\boxed{\sf Energy = 450 \: kJ}}}$

Explanation:

Given that -

Power of the heater = 1.5 kW,

Convert the kW into watt,

Power = 1.5 * 10³

⇒ P = 1500 Watt

Time = 5 minutes

⇒ t = 5 * 60

⇒ t = 300 seconds

Now, we need to find the energy consumed by the heater.

We know that ;

Energy = power * time

⇒ Energy = 1500 * 300

⇒ Energy = 450000

⇒ Energy = 4.5 * 10^5

⇒ Energy = 4.5 * 10² kJ

⇒ Energy = 450 kJ

Hence, the energy consumed is 450 kJ.