Question

An electric bulb is rated 200V-100W.What is its resistance?5 such bulbs burn for 4d hours.what is the electric energy consumed?Calculate the cost @ 50 paise/unit.

Answer 1

P=V sq / R
here, Power, p=100W
Voltage,V= 200volts
and resistance,R=?
100=(200) sq/ R
so R =400 ohms
B. Calculation of Electrical Energy.
E=P×t
P=100/1000 kilowats
=> 0.1 kilowatt
And t=4 hours
so Energy Consumed by 1 bulb=> 0.1×4
=>0.4 kilowatt
and, Energy Consumed by 5 bulbs=> 0.4×5
=> 2 kilowatt-hour
C. Cost of Energy Consumed=> 50/100×2
=> cost is rupees 1 ...
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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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