A torch bulb is rated 2.5 volts and 750 mA. Calculate:(i)it's resistance (ii) it's power (iii) energy consumed if this bulb is lighted for four hours.

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Solution

Given :
V=2.5 V
I=750mA= 750x10⁻³A
power =p=?
Power =VI
=2.5x750x10⁻³
=1.875W
reistance :
V=IR
R=V/I=2.5/750x10⁻³=3.3 ohms
Energy consumed if bulb is lighted for 4 hours :
E=pt=1.875x4=7.500Wh=27x 10³ joules

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A torch bulb is rated 2.5 volts and 750 mA. Calculate:(i)it's resistance (ii) it's power (iii) energy consumed if this bulb is lighted for four hours.

Given : V=2.5 V I=750mA= 750x10⁻³A power =p=? Power =V*I =2.5x750x10⁻³ =1.875W reistance : V=IR R=V/I=2.5/750x10⁻³=3.3 ohms Energy consumed if bulb is lighted for 4 hours : E=p*t=1.875x4=7.500Wh=27x 10³ joules Read more on Brainly.in - https://brainly.in/question/330022#readmore

Given :
V=2.5 V
I=750mA= 750x10⁻³A
power =p=?
Power =VI
=2.5x750x10⁻³
=1.875W
reistance :
V=IR
R=V/I=2.5/750x10⁻³=3.3 ohms
Energy consumed if bulb is lighted for 4 hours :
E=pt=1.875x4=7.500Wh=27x 10³ joules

Read more on Brainly.in - https://brainly.in/question/330022#readmore