Question

A BULB IS RATED AT 200 VOLT-100 WATT. WHAT IS ITS RESISTENCE. FIVE SUCH BULBS BURN FOR 4 HOURS .WHAT OS THE ELECTRICAL ENERGY CONSUMED. CALCULATE THE COST IF THE RATE IS 50 PAISE PER UNIT

Answer 1

electrical energy consumed
E.E =p*t=100*4*3600=1440kj by the single bulb
For 5 such bulb
1440*5=7200kj

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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