when 40 watts and 60 watts bulb is connected in series,
which bulb glows brightly ?
Answer Posted / wareagle
Ksb Quote "40 wattbulb has higher resistance(1440) so a
low current pass through it but 60 watt has low resistance
it glows brightly" That would be true if the bulbs are
connected in parallel but they are connected in series.
Read the question. Do you know what that means?
Ksbn That is incorrect. Lets find the answer.
Voltage = 240 volts
Watts = 40 watt and 60 watts
R60 = 240x240/60= 960 ohms
R40 = 240x240/40= 1440 ohms
Total of R60 + R40 = 960 + 1440 = 2400 ohms for series ckt
Amps = 240/2400 = 0.10 amps flowing thru both 40w and 60w
watts = amp²x R
watts for 60 watt = amp²x R = 0.10² x 960 = 0.01 x 960 =
9.6 watts
watts for 40 watt = amp²x R = 0.10² x 1440 = 14.4 watts
Therefore 40 watt is brighter.
Remember the bulbs are connected in series not parallel.
Is This Answer Correct ? | 38 Yes | 1 No |
Post New Answer View All Answers
Can anyone please provide me details of MCCB/Contactor/SFU rating calculations for a motor feeder..for example 50 kw.. not from type-2 cordination chart. i want manual calculations..
What is vaccum currcuit breaker.define with cause and where be use it device?
what do you mean by every IC 74 first digit.why are you using this no.why not using another no.
What happened when capacitor connect series in ac circuit?
How do u analyse protection fault when vcb tripping on load
how to compute kAIC? with formulas...
How you calculate the repturing capacity of a HRC fuse
hi....I am from india..i have completed my engineering in electrical and electronics field with 58.4% and my IELTS score is 5.5 bands....Recently i received my I-20 in computer and information science from Troy university in Alabama.On 18th i have a visa interview can u please tell me what type of questions i have to answer ??????
draw the full wave and half wave circuit of 3 phase system and inverter circuit used in ups
how to calculate
What is meant by load angle of an alternator? Upon what factors does the load angle depend?
What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?
How can I calculate ISF of current transformer?
how can we change the polarity of Alternating current rapidly? how frequency of ac can be controlled and changed easily?
why HT armoured cable does not glanding