Question

An electric lamp is marked 220 V, 100 W. It is used for 5 hours daily. Calculate:
(a) its resistance while glowing
(b) energy consumed in kWh/day.

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Answer 1

Answer:

Given:-1)LAMP WORKS ON 220V VOLTAGE.

2)AND IT CONSUMES 40W OF POWER PER HOUR.

TO FIND

3)ITS INTERNAL RESISTANCE.

4)THEN ITS POWER CONSUMED IN kWh.

a)Easy simple using basics: We know relation POWER=VOLTAGE^2/RESISTANCE

40W=220V^2/RESISTANCE

Then R=1210 ohms.

b)AS WE KNOW 1 kWh IS POWER CONSUMPTION OF 1000W FOR ONE HOUR.

THEN 40W*4HR=160W

Converting into KwH 160W/1000=0.16kWh. Of power.

Step-by-step explanation:

Answer 2

Answer:

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