If an electric bulb of 100 W is lighted for 3 hours daily. How much electrical energy would be consumed daily? Also find the cost if cost per unit is ₹3.
Answers
Explanation:
heat is power consumptio in one second and si unit is joule sorry for the mistake above
Given:-
→ Power of the electric bulb = 100 W
→ Time for which it is lighted = 3 hours
→ Cost per unit = ₹3
To find:-
→ Electrical energy consumed daily.
→ Cost of electricity.
Solution:-
Firstly, let's convert the power of the bulb from W to kW.
⇒ 1 W = 0.001 kW
⇒ 100 W = 100(0.001)
⇒ 0.1 kW
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Now, we know that :-
Energy = Power × Time
Energy consumed by the bulb/day :-
= 0.1 × 3
= 0.3 kWh
Cost of electricity:-
= 0.3 × 3
= ₹0.9
Thus :-
• Energy consumed by the bulb daily is
0.3 kWh .
• Cost of electricity is ₹0.9 .
Some Extra Information:-
• kWh is the commercial unit of energy
and is used by electricity boards.
• If power is in kW and time is hour, then
the unit of energy is kWh.
• 1 kWh = 1000 W × 3600 s
= 3600000 Ws
= 3600000 J
= 3.6×10⁶ J