Advertisements
Advertisements
Question
A wire of uniform thickness with a resistance of 27Ω is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination.
Advertisements
Solution
Wire cut into three pieces means new resistance = `27/3` = 9 ohm
Now three resistance connected in parallel :
`1/"R"_"P"=1/"R"_1+1/"R"_2+1/"R"_3=1/9+1/9+1/9`
RP = `9/3` = 3 ohm
RELATED QUESTIONS
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
Complete the following sentence:
Fuse wire has a ............ Melting point and it is made of an alloy of ......... and if the current in a circuit rises too high, the fuse wire ...........
The following appliances are to be used on 240 V supply. Calculate the current used by each and say which fuse, 2 amp, 5 amp or 13 amp should be incorporated with each, (i) A television rated at 150 W, (ii) An electric iron rated at 750 W, (iii) An immersion heater rated at 3000 W, (iv) A hair dryer rated at 500 W. How much will it cost to run the television set for 100 days for an average of 4 hours a day at 60 paise per unit?
Calculate the current through a 60 W lamp rated 250 V. If the line voltage falls to 200 V, how is power consumed by the bulb affected?
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
Kilowatt hour is the unit of
One unit of electrical energy consumed is equal to 1000 kilowatt-hour.
Conventionally, the direction of the current is taken as:
