A torch bulb is rated 2.5v and 750mA. calculate. a it's power , b its resistance and, c then energy consumed if this bulb is lighted for 4 hours.
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power =V *I
=1.875watt
resistance=V divide by I
=3.33ohm.
energy consumed=p*t
=1.875 *4
=7.5Wh
=2.7*10³joules
=1.875watt
resistance=V divide by I
=3.33ohm.
energy consumed=p*t
=1.875 *4
=7.5Wh
=2.7*10³joules
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