Q- A torch bulb rated at 2-5 volts- 500 mA- Find its i- power nbsp- ii- resistance and iii- the energy consumed if this bulb is lighted for 4 hours- nbsp-

Dear #160;student,Power=VI=25 #215;500 #215;10 3=12.5WResistance=VI=25500 #215;10 3=50ohmenergy #160;consumed=12.5 #215;4=50WhRegards ...

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Standard VII

Physics

Measurement and Calculation of Electricity Usage

Q. A torch bu...

Question

Q. A torch bulb rated at 2.5 volts, 500 mA. Find its i) power ii) resistance and iii) the energy consumed if this bulb is lighted for 4 hours.

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Solution

$D e a r s t u d e n t, P o w e r = V I = 25 \times 500 \times 10^{- 3} = 12.5 W R e s i s \tan c e = \frac{V}{I} = \frac{25}{500 \times 10^{- 3}} = 50 o h m e n e r g y c o n s u m e d = 12.5 \times 4 = 50 W h R e g a r d s$

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Q. A torch bulb rated at 2.5 volts, 500 mA. Find its i) power ii) resistance and iii) the energy consumed if this bulb is lighted for 4 hours.

Dear student,Power=VI=25×500×10-3=12.5WResistance=VI=25500×10-3=50ohmenergy consumed=12.5×4=50WhRegards

$D e a r s t u d e n t, P o w e r = V I = 25 \times 500 \times 10^{- 3} = 12.5 W R e s i s \tan c e = \frac{V}{I} = \frac{25}{500 \times 10^{- 3}} = 50 o h m e n e r g y c o n s u m e d = 12.5 \times 4 = 50 W h R e g a r d s$