Last seen: Jul 17, 2023
If ignition temp of a fuel is 80°C, this means that minimum 80°C is required for the ignition of the fuel.
Ignition temperature of fuel can be defined as the minimum temperature to which a fuel must be heated so that it may catch fire and start burning.
LPG, due to its higher calorific value.
Calorific value of LPG is 50kJ/gm means that if 1 gram of LPG is burnt completely, then it will produce 50kJ of heat energy.
The amount of heat produced by burning 1 gram of a fuel completely is known as its calorific value.
Nuclear fuels (like uranium)
Let the maximum number of tube-lights be y. Power of y tube-lights, P = 36y V = 230V, I = 5A We know that P = VI 36y = 230 x 5 36y = 1500 ...
(a) It is more dangerous to touch the live wire rather than the neutral wire because live wire has a high potential of 220V, where as neutral wire has...
No earth connection is required for the bulb connection as it does not draw heavy current and we hardly touch it. A socket for using an electric iron ...
P1 = 1200W, P2 = 1000W V = 220V Fuse rating = 9A We know, P = VI Total current required I = = (P1+P2)/V = (1200+1000)/220 = 10A ...
Circuit A is not dangerous after fuse blows because fuse is fitted in the live wire; but circuit B is dangerous even if fuse blows because the fuse is...
(a) The appropriate value of the fuse to be fitted in the circuit is 2.5A or 3A. (b) If a 13A fuse is fitted in the circuit, it will not protect the...
P1 = 60 W, P2 = 1200W, P3 = 500W Fuse rating = 10A V = 220V We have, P = VI Total power = 60 + 1200 + 500 = 1760W Therefore, 1760 = 22...
Given: P = 3.2kW = 3200W, Fuse current rating = 10 A V = 220 V We have P = VI 3200 = 220 x I I = 14.54 A As the required current for th...
(a) figure.png (b) Two hazards associated with the use of electricity are: (i) If a person happens to touch a live electric wire, he gets a se...
(a) Fuses are fitted in the fuse box of a domestic electricity supply to protect the whole wiring of the house when excessive current flows in the cir...
(a) P = 3kW = 3000W V = 240V P = V x I I = = = 12.5 A. (b) A 13A fuse should be used in the geyser circuit.
When the live wire of a faulty appliance comes in direct contact with its metallic case, which has been earthed, the large current passes directly to ...
(a) V = 230V, P = 750 W, t = 30/60 = 0.5hr (i) Let max current be I We have P = VI 750 = 230 x I I = 3.26 A (ii) Electric energy consumed, E...
(i) A fuse is one of most important protection devices, which is used for avoiding the damages happening due to over load or short circuit. (ii) An ...