a. Live wire and neutral wire.
|Live wire||Neutral wire|
|It carries current to the device from the source.||It carries current from the device to the source.|
|It is red or brown in color.||It is black or blue in color.|
b. AC and DC.
|The current that changes magnitude and polarity is called AC.||The current that doesn't change magnitude and polarity is called DC.|
|It is produced by an AC generator.||It is produced by cells, batteries, etc.|
|It has a non-zero frequency.||It has a zero frequency.|
c. Filament and flueoresent lamp.
|It is filled with inert gas.||It is filled with mercury vapor.|
|Its average lifespan is about 1000 hours.||Its average lifespan is about 3000 hours.|
|It is cheaper.||It is expansive.|
|It converts 10% to light and 90% to heat energy.||It converts 30% to light and 70% to heat energy.|
d. Dynamo and electric motor.
|It converts mechanical energy to electrical.||It converts electrical energy to mechanical.|
|It works on the principle of Faraday's law of electromagnetic induction.||It works on the principle of motor effects.|
|The direction of current can be found by using fleming's right-hand rule.||The direction of current can be found by using fleming's left-hand rule.|
e. Step up and step down transformer.
|Step up||Step down|
|It converts low AC voltage to high AC voltage.||It converts high AC voltage to low AC voltage.|
|The number of turns is more in the secondary coil than in the primary.||The number of turns is more in the primary coil than in the secondary.|
|It is used on the power transmission line to increase voltage.||It is used in household devices to run at least 220V.|
f. Tungsten and nichrome.
|It has very high resistance.||It has comparatively low resistance.|
|It doesn't oxidize at high temperatures.||It oxidizes in high temperatures.|
|It is the wire of nickel, etc.||It is the wire of copper, etc.|
g. Electricity obtained from generator and battery.
|From generator||From battery|
|It generates AC electricity.||It generates DC electricity.|
|Mechanical energy is converted into electrical.||Chemical energy is converted into electrical.|
|Electricity produced by it changes its polarity.||Electricity produced by it doesn't change its polarity.|