Question

solve the problem...​

Answer 1

Answer:

• 25 Watt is the Power of Lamp.
• 1.38 × 10⁻⁴ kWh is the required answer

Explanation:

Given:-

• Energy Consumes ,E = 500 J

• Time taken ,t = 20 s

To Find:-

• Power of lamp ,P.

Solution:-

• Energy Consumes by a body is defined as the product of power of appliances & time taken.

• E = P× t

Substitute the value we are

→ 500 = P × 20

→ P = 500/20

→ P = 50/2

→ P = 25 watt.

• Hence, the power of the Lamp is 25 Watts.

• Now, we have to calculate the energy consumed by lamp which operates for 2 hour daily for 15 days.

• E = P× t

Substitute the value we get

→ E = 25 × (2 × 15)

→ E = 25 × 30

→ E = 500 J

As we know that 1 Unit or kWh = 3.6×10⁶ J

Therefore, 500 J = 500/3.6×10⁶

→ 500×10⁻⁶ /3.6 unit

→ 138 × 10⁻⁶ unit

→ 1.38 × 10⁻⁴ Unit

Hence, the energy consumed by the Lamp in Unit is 1.38 ×10⁻⁴ unit or kWh.