Question

A lamp consumes 5000J of electrical energy in 100 sec.what is its power ?​

Answer 1

Given :

• Electrical energy consumed by Lamp, E = 5000 J
• time taken, t = 100 sec

To find :

• Power of Lamp, P = ?

Formula required :

• Formula to calculate power

        P = E / t

[ Where P is power, E is energy, t is time ]

• Electrical power is defined as the electrical energy consumed per unit time.
• SI unit of Electrical power : Watt
• 1 Watt = 1 Joule/sec

• Dimensional formula : [ M L² T⁻³ ]

Calculation :

Using formula for Electrical power

→ P = E / t

Putting values in RHS

→ P = 5000 / 100

→ P = 50 Watt

Therefore,

• Power of Lamp is 50 Watt.

Answer 2

Answer:

✡ Given ✡

⬛A lamp consumes 5000J of electrical energy.

⬛Time= 100 sec

✡ To Find ✡

⬛ Power = ?

✡ Formula Used ✡

✴ P = $\dfrac{E}{t}$

( where,

• P = power
• E = energy
• t = Time taken

✡ Solution ✡

▶ According to the question by using formula we get,

=> P = $\dfrac{5000}{100}$

=> P = $\text{\large\underline{\pink{50 watt}}}$

∴ Power of lamp is 50 watt.