Advertisements
Advertisements
Question
Point out two main disadvantages of ‘Tree System’.
Advertisements
Solution
The three main disadvantages are:
(i) Longer length of wire is required for wiring different rooms in a house. Since all circuits start from the main distribution board and so it is comparatively more Expensive.
(ii) If fuse blows off in any part of the building, it disconnects all the appliances in the circuit.
RELATED QUESTIONS
1 kWh = ________ J
In a filament type light bulb, most of the electric power consumed appears as:
(a) visible light
(b) infra-red-rays
(c) ultraviolet rays
(d) fluorescent light
Two lamps, one rated 220 V, 50 W and the other rated 220 V, 100 W, are connected in serieswith mains of 220 V. Explain why does the 50 W lamp consume more power
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 dissipated in each resistor.
Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.
Name a metal that is used as an electron emitter. Give one reason for using this metal.
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the energy supply in kWh to the three heaters in 5 hour.
An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?
The equation I2R seems to suggest that the rate of heating in a resistor is reduced if resistance decreases, whereas equation P = V2/R suggests just the opposite. How do you reconcile this problem?
