Interested to Buy Any Domain ? << Click Here >> for more details...
when 40 watts and 60 watts bulb is connected in series,
which bulb glows brightly ?
- 5 Answers
- 17944 Views
- I also Faced
- E-Mail Answers
Answer Posted / syed golam kibria
'V' across both the bulbs will be the same...
we have,
P=V^2/R;
R=V^2/P;
so calculating resistances,
R60=240*240/60=960ohm,
R40=240*240/40=1440ohm,
Req=(960*1440)/(960+1440)=576ohm,
Total current through the circuit:
240/576=0.625A
current through the 40W bulb,
0.25A
current through the 60W bulb,
0.375A
Now,
E=i^2*r*t
E40=0.25*0.25*1440*t=90t
E60=0.375*0.375*960*t=135t
for a same time period 't'...60W bulb dissipates more energy...
so the 60W bulb glows brightly...
| Is This Answer Correct ? | 4 Yes | 27 No |
Post New Answer View All Answers
i have interview in Pepsi company what type of question will ask please send the question and answeer
please anybody help me to find out the BHEL trainee Exam previous year questions papers . if u ve pls. send it to surekhared@gmail.com
How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...
why the active power flow of some line is increased when the active power of out is cut ?
- two pumps must work with them at the same time but if the first pump start the second pump must delayed for some time to start also , with motor rated power = 90 KW and rated voltage = 380 V and rated power factor = 0.85 lag please draw the power and control circuit for it and determine all circuit components parameters that you use it
why effective resistance should be more than static resistance in transmission line?
How dia computation perfomed in cold rolling mills .
How to calculate of maximum demand if given 628kw, 785kva, 0.8 p.f.
how to convert lv line to hv line and viseversa, any losses will occur during this process
What safety precaution are to be taken for avoiding electric hazards ?
Draw the single line diagram of the power station?
How efficiency of thermal plant can be improved?
I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?
please explain how to do 'pole drop test' on generator?
please send privious years question papers of jindal steel and power ltd.My e mail id is rajanikant.sngh@gmail.com
