Advertisements
Advertisements
प्रश्न
Household wiring for lamp connections can either be done in parallel or in series.Which one would you prefer? Give a reason for your answer.
Advertisements
उत्तर
We would prefer the parallel wiring. This is done for the following reasons:
(i) In parallel wiring, each lamp can have its independent switch and the disconnection (putting off) of one of them will not effect the other lamps.
(ii) All lamps have the same potential difference (equal to that of the mains) across the terminals and are thus able to work as per their specified rating.
संबंधित प्रश्न
An electric bulb is rated at 220 V, 100 W. What is its resistance?
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.
State the S.I. unit of electrical power.
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Define electric power. An electrical device of resistance R is connected across a source of voltage V and draws a current I. Derive an expression for power in terms of current and resistance.
In an electric radiator or room heater, state with reason, why the porcelain tube wound with a nichrome wire is placed between the pole and principal focus of the parabolic concave reflector.
‘The current rating of a fuse is 5A’. Comment on this statement.
You are required to connect a bulb, a fan and a socket outlet to the mains in one set A and an air-conditioner and a refrigerator to the mains in other set B. Will you recommend the wire of same thickness and same insulation in both? explain your answer.
An electric iron is rated at 230 V, 750 W. What is its resistance? What maximum current can be passed through it?
An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.
