Question

A electric bulb is rated at 200v-100w. What is
its resistance? Five such bulbs burns for
4 hour. What is the electrical energy consumed?
calculate the cost if the rate is 50 paise per
unit.​

Answer 1

Answer:

R= 400, UNIT= 0.8 , RUPEES =40 PAISA

Explanation:

Answer 2

$\huge\fbox\orange{\underline{Question:–}}$

An electric bulb is rated at 200w-100w what is the resistance of 5 such bulbs burn for 4 hours. What is the electrical energy consumed. Calculate the cost if the rate is 50 paise per unit.

$\huge\fbox\orange{\underline{Answer:–}}$

Using, P = $\large{V²}{R}$

we get R = $\large{V²}{P}$

= $\large{(200)²}{100}$

= 400

Energy consumed = P x t

= 100 x 4

= 400 Wh

= 0.4 kWh

Cost at the rate of 50 paise per unit

= Rs (0.50 x 0.4)

= Rs 2

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