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S torch bulb is rated at 3 V & 600mA. Calculate it's(a) power (b) resistance (c) energy consumed if it is lighted for 4 hours

Posted by Khushi Jain 5 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Saksham Kumar 5 years, 8 months ago

voltage, V=3V current, I= 600 mA= 600/1000 A= 0.6A time, t= 4h (a) power, P= V*I= 3*0.6=1.8W (watt) (b) resistance, R= V/I= 3/0.6= 5Ω(ohms) (c) energy consumed, E= P*t= 1.8/1000kW*4h= 0.0072kWh now, 1kWh= 3600000J 0.0072kWh=0.0072*3600000J=25920J

0Thank You

Lucifer?? Morningstar?? 5 years, 8 months ago

(a) 1.8 volt per ampere(b) 5Ω (c) 7.2 joule

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