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CBSE Class 10 Answered

An electric bulb and heater are rated as (100watt-220volt) and (1000 watt-220v) respectively . Compare their resistance.
Asked by Anjukayal86477 | 23 May, 2019, 02:38: PM
answered-by-expert Expert Answer
Power = voltage×current = voltage×(voltage/Resistance)
 
Hence Resistance = (voltage)2/power
 
hence resistance of 100W-220V bulb = 220×220/100 =  484 Ω
resistance of 1000W-220V heater = 220×220/1000  = 48.4 Ω
Answered by Thiyagarajan K | 23 May, 2019, 04:09: PM
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