Question

A bulb is rated at 200v-100w what is it resistance five such bulbs burn for 4 hours what is the electric energy consumed calculate the cost if its rate is 4.50 per unit .


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Answer 1

hii your answer is 7,20,000

Step-by-step explanation:

please mark me the brainleist

Answer 2

• Resistance of the bulb is 400 Ω.
• 2 kWh of electrical energy is consumed.
• Required cost is ₹ 9

Explanation :-

we have :-

→ voltage of the bulb (V) = 200 V

→ power of the bulb (P) = 100 W

→ Time = 4 hrs

→ cost Per unit = ₹ 4.50

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Firstly, let's calculate the resistance of the bulb

P = V²/R

--» 100 = (200)²/R

--» 100 = 40000

--» R = 40000/100

--» R = 400 Ω

Now, we have to Firstly calculate the energy consumed bu thr bulbs by in "kWh" and then we can calculate the required cost.

Energy consumed by Five bulbs

= power × Time

= 5(100 × 4)

= 5(400)

= 2000 Wh

= 2 KWh

Required cost :-

• Number of unit × cost
• = 2 × 4.5
• = ₹ 9