27. Answer these questions :
A. Derive the relation of commercial unit of electric energy with S.I. Unit of energy
B. An electric bulb is rated as 100 W,220V. It is used for 5 hours daily Calculate
a) It's resistance while glowing
b) Energy consumed in kWh per day
C. A child has drawn the electric circuit to study Ohm's law. The teacher told that the circuit diagram
needs correction. Study the diagram and redraw it after making corrections.
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Answer:
1)1 kWh = 3600000 J
2) P =V * V/R
R = V * V/P
= 220 * 220/ 100
= 484 ohm
3) Electrical energy
= P(W) * t(hrs)/1000
= 100 * 5 / 1000
= 0.5 kWh
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All the best for the exam
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