Advertisements
Advertisements
Question
What is the meaning of the symbol kWh? Which quantity does it represent?
Solution
The symbol KWh stands for kilowatt-hour. It is the commercial unit of electrical energy.
APPEARS IN
RELATED QUESTIONS
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
Name two gases which are filled in filament type electric light bulbs.
Electrical power p is given by the expression P = (Q × V) ÷ time. Express the power P in terms of current and resistance explaining the meaning of symbols used there in.
Name the S.I unit of electrical energy. How is it related to Wh?
State the S.I. unit of electrical power.
A geyser is rated 1500 W, 250 V. This geyer is connected to 250 V mains. Calculate:
(i) the current drawn
(ii) the energy consumed in 50 hours, and
(iii) the cost of energy consumed at Rs. 4.20 per kWh
A simple electric circuit has 24 V battery and a resistor of 60 Ω. What will be the current in the circuit? The resistance of the connecting wires is negligible.
Two resistors A and B of 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power supplied by the battery.
What would happen and why, to an electric bulb when it is connected across a supply of voltage (i) lower (ii) higher than its proper rating?
An Electric bulb is marked 100 W, 230 V. What how long would this lamp take to consume one unit of electricity?
